diff --git a/css/swad21.76.3.css b/css/swad21.76.4.css
similarity index 98%
rename from css/swad21.76.3.css
rename to css/swad21.76.4.css
index 60592028..9f4a279a 100644
--- a/css/swad21.76.3.css
+++ b/css/swad21.76.4.css
@@ -69,7 +69,7 @@ table th
 	{
 	box-sizing:border-box;
 	padding:0;
-	color:#4D88A1;
+	color:#4d88a1;
 	font-weight:bold;
 	}
 table td
@@ -1286,7 +1286,6 @@ a:hover						/* Default ==> underlined */
 	padding:5px;
 	border-radius:2px;
 	font-size:11pt;
-	color:#4d88a1;
 	}
 #MFU_actions ul
 	{
@@ -1294,7 +1293,7 @@ a:hover						/* Default ==> underlined */
 	box-sizing:border-box;
 	width:138px;
 	margin:2px 0;
-	padding:2px 0 0 0;
+	padding:6px 0 0 0;
 	border-style:solid;
 	border-width:1px 0 0 0;
 	border-color:rgba(140,188,206,0.2);
@@ -1807,17 +1806,20 @@ a:hover img.CENTER_PHOTO_SHOW
 	padding:5px;
 	border-radius:2px;
 	font-size:11pt;
-	color:#4D88A1;
 	}
 #institutional_links ul
 	{
+	display:inline-block;
 	box-sizing:border-box;
 	width:138px;
-	margin-top:2px;
-	padding-top:2px;
+	margin:2px 0;
+	padding:6px 0 0 0;
 	border-style:solid;
 	border-width:1px 0 0 0;
 	border-color:rgba(140,188,206,0.2);
+	list-style-type:none;
+	text-align:left;
+	vertical-align:middle;
 	}
 #institutional_links li
 	{
@@ -1829,8 +1831,6 @@ a:hover img.CENTER_PHOTO_SHOW
 .INS_LNK
 	{
 	padding:1px;
-	font-size:11pt;
-	color:#4D88A1;
 	}
 
 /*********************************** Alerts **********************************/
@@ -2311,7 +2311,7 @@ table.CELLS_PAD_10	> tbody > tr > td {padding:10px;}
 .TITLE_WHITE	{color:#505050; font-size:18pt;}
 .TITLE_GREY	{color:#505050; font-size:18pt;}
 .TITLE_PURPLE	{color:#573c4d; font-size:18pt;}
-.TITLE_BLUE	{color:#4D88A1; font-size:18pt;}
+.TITLE_BLUE	{color:#4d88a1; font-size:18pt;}
 .TITLE_YELLOW	{color:#7c4d2a; font-size:18pt;}
 .TITLE_PINK	{color:#63474e; font-size:18pt;}
 .TITLE_DARK	{color:#505050; font-size:18pt;}
@@ -2725,26 +2725,32 @@ table.CELLS_PAD_10	> tbody > tr > td {padding:10px;}
 .CLASSPHOTO_DARK	{color:#d0d0d0;}
 
 /************************** Left column menu *********************************/
-.LINK_TITLE, .MFU_TITLE	{color:#4D88A1;}
+.INS_LNK_WHITE,		.MFU_WHITE	{color:#4d88a1;}
+.INS_LNK_GREY,		.MFU_GREY	{color:#4d88a1;}
+.INS_LNK_PURPLE,	.MFU_PURPLE	{color:#4d88a1;}
+.INS_LNK_BLUE,		.MFU_BLUE	{color:#4d88a1;}
+.INS_LNK_YELLOW,	.MFU_YELLOW	{color:#4d88a1;}
+.INS_LNK_PINK,		.MFU_PINK	{color:#4d88a1;}
+.INS_LNK_DARK,		.MFU_DARK	{color:#a6c4d0;}
 
 /*****************************************************************************/
 .MSJ_AVISO		{color:#632921; font-size:12pt;}
-.TIT_TBL		{color:#4D88A1; font-size:12pt; font-weight:bold;}
+.TIT_TBL		{color:#4d88a1; font-size:12pt; font-weight:bold;}
 
-.GRP_TITLE		{color:#4D88A1; font-size:15pt; font-weight:bold;}
+.GRP_TITLE		{color:#4d88a1; font-size:15pt; font-weight:bold;}
 
-.ASG_TITLE		{color:#4D88A1; font-size:15pt; font-weight:bold;}
+.ASG_TITLE		{color:#4d88a1; font-size:15pt; font-weight:bold;}
 .ASG_TITLE_LIGHT	{color:#AFC4CC; font-size:15pt; font-weight:bold;}
-.ASG_LABEL		{color:#4D88A1; font-size:13pt;}
+.ASG_LABEL		{color:#4d88a1; font-size:13pt;}
 .ASG_LABEL_LIGHT	{color:#AFC4CC; font-size:13pt;}
-.ASG_GRP		{color:#4D88A1; font-size:12pt;}
+.ASG_GRP		{color:#4d88a1; font-size:12pt;}
 .ASG_GRP_LIGHT		{color:#AFC4CC; font-size:12pt;}
 
 .DATE_RED		{color:#660000; font-size:13pt;}
 .DATE_RED_LIGHT		{color:#f98a8a; font-size:13pt;}
 .DATE_GREEN		{color:#008000; font-size:13pt;}
 .DATE_GREEN_LIGHT	{color:#89BE87; font-size:13pt;}
-.DATE_BLUE		{color:#4D88A1; font-size:13pt;}
+.DATE_BLUE		{color:#4d88a1; font-size:13pt;}
 .DATE_BLUE_LIGHT	{color:#AFC4CC; font-size:13pt;}
 
 .ASG_LST_DATE_GREEN	{color:#008000; font-size:11pt; white-space:nowrap;}
@@ -2781,7 +2787,7 @@ table.CELLS_PAD_10	> tbody > tr > td {padding:10px;}
 	{
 	text-align:left;
 	vertical-align:middle;
-	color:#4D88A1;
+	color:#4d88a1;
 	font-size:11pt;
 	}
 
@@ -3535,9 +3541,9 @@ table.CELLS_PAD_10	> tbody > tr > td {padding:10px;}
 	overflow:hidden;
 	text-overflow:ellipsis;
 	}
-.AUTHOR_TXT			{color:#4D88A1; font-size:11pt;}
+.AUTHOR_TXT		{color:#4d88a1; font-size:11pt;}
 .AUTHOR_TXT_LIGHT	{color:#AFC4CC; font-size:11pt;}
-.AUTHOR_TXT_NEW		{color:#4D88A1; font-size:11pt; font-weight:bold;}
+.AUTHOR_TXT_NEW		{color:#4d88a1; font-size:11pt; font-weight:bold;}
 
 /************************** Owner of assignments and works *******************/
 .OWNER_WORKS_PHOTO
@@ -3969,15 +3975,15 @@ table.CELLS_PAD_10	> tbody > tr > td {padding:10px;}
 	font-size:13pt;
  	line-height:1.4;
 	}
-.MSG_TIT	{color:#4D88A1; font-size:13pt;}
-.MSG_TIT_NEW	{color:#4D88A1; font-size:13pt; font-weight:bold;}
+.MSG_TIT	{color:#4d88a1; font-size:13pt;}
+.MSG_TIT_NEW	{color:#4d88a1; font-size:13pt; font-weight:bold;}
 .MSG_TIT_REM	{color:#AFC4CC; font-size:13pt;}
 .MSG_TIT_BG
 	{
 	background-image:-webkit-linear-gradient(#eaf3f6 0,#eaf3f6 80%,white 100%);	/* Safari */
 	background-image:linear-gradient(#eaf3f6 0,#eaf3f6 80%,white 100%);
 	background-repeat:no-repeat;
-	color:#4D88A1;
+	color:#4d88a1;
 	font-size:13pt;
 	}
 .MSG_TIT_BG_NEW
@@ -3985,7 +3991,7 @@ table.CELLS_PAD_10	> tbody > tr > td {padding:10px;}
 	background-image:-webkit-linear-gradient(#f5ffd7 0,#f5ffd7 80%,white 100%);	/* Safari */
 	background-image:linear-gradient(#f5ffd7 0,#f5ffd7 80%,white 100%);
 	background-repeat:no-repeat;
-	color:#4D88A1;
+	color:#4d88a1;
 	font-size:13pt;
 	font-weight:bold;
 	}
@@ -4002,7 +4008,7 @@ table.CELLS_PAD_10	> tbody > tr > td {padding:10px;}
 	background-image:-webkit-linear-gradient(#eaf3f6 0,#eaf3f6 80%,white 100%);	/* Safari */
 	background-image:linear-gradient(#eaf3f6 0,#eaf3f6 80%,white 100%);
 	background-repeat:no-repeat;
-	color:#4D88A1;
+	color:#4d88a1;
 	font-size:11pt;
 	}
 .MSG_AUT_BG_NEW
@@ -4010,7 +4016,7 @@ table.CELLS_PAD_10	> tbody > tr > td {padding:10px;}
 	background-image:-webkit-linear-gradient(#f5ffd7 0,#f5ffd7 80%,white 100%);	/* Safari */
 	background-image:linear-gradient(#f5ffd7 0,#f5ffd7 80%,white 100%);
 	background-repeat:no-repeat;
-	color:#4D88A1;
+	color:#4d88a1;
 	font-size:11pt;
 	font-weight:bold;
 	}
@@ -4022,8 +4028,8 @@ table.CELLS_PAD_10	> tbody > tr > td {padding:10px;}
 	color:#AFC4CC;
 	font-size:11pt;
 	}
-.MSG_DATE	{color:#4D88A1; font-size:11pt;}
-.MSG_DATE_NEW	{color:#4D88A1; font-size:11pt; font-weight:bold;}
+.MSG_DATE	{color:#4d88a1; font-size:11pt;}
+.MSG_DATE_NEW	{color:#4d88a1; font-size:11pt; font-weight:bold;}
 
 .BT		{width:20px; text-align:center; vertical-align:top;}
 .BT0		{width:20px; text-align:center; vertical-align:top; background-color:#F4F2EA;}
@@ -4064,7 +4070,7 @@ a.PAG:hover, .PAG_CUR
 	{
 	font-size:13pt;
 	font-weight:bold;
-	color:#4D88A1;
+	color:#4d88a1;
 	}
 
 /***************************** Calls for exams *******************************/
@@ -4253,7 +4259,7 @@ a.PAG:hover, .PAG_CUR
 	}
 .INDICATORS th
 	{
-	color:#4D88A1;
+	color:#4d88a1;
 	font-size:12pt;
 	font-weight:bold;
 	}
diff --git a/swad_MFU.c b/swad_MFU.c
index ec2652e3..66a4a891 100644
--- a/swad_MFU.c
+++ b/swad_MFU.c
@@ -249,6 +249,7 @@ void MFU_WriteBigMFUActions (struct MFU_ListMFUActions *ListMFUActions)
 void MFU_WriteSmallMFUActions (struct MFU_ListMFUActions *ListMFUActions)
   {
    extern const char *Ico_ClassColor[Ico_NUM_COLORS][The_NUM_THEMES];
+   extern const char *The_Colors[The_NUM_THEMES];
    extern const char *Txt_My_frequent_actions;
    extern const char *Txt_Frequent_ACTIONS;
    extern const char *Txt_TABS_TXT[Tab_NUM_TABS];
@@ -260,11 +261,11 @@ void MFU_WriteSmallMFUActions (struct MFU_ListMFUActions *ListMFUActions)
    char TabMenuStr[MFU_MAX_BYTES_TAB + 6 + MFU_MAX_BYTES_MENU + 1];
 
    /***** Begin div and link *****/
-   HTM_DIV_Begin ("id=\"MFU_actions\"");
+   HTM_DIV_Begin ("id=\"MFU_actions\" class=\"MFU_%s\"",
+                  The_Colors[Gbl.Prefs.Theme]);
 
       Frm_BeginForm (ActMFUAct);
-	 HTM_BUTTON_OnSubmit_Begin (Txt_My_frequent_actions,
-	                            "BT_LINK MFU_TITLE",NULL);
+	 HTM_BUTTON_OnSubmit_Begin (Txt_My_frequent_actions,"BT_LINK",NULL);
 	    HTM_TxtF ("%s",Txt_Frequent_ACTIONS);
 	 HTM_BUTTON_End ();
       Frm_EndForm ();
diff --git a/swad_changelog.h b/swad_changelog.h
index 30bc3734..1b3f96b8 100644
--- a/swad_changelog.h
+++ b/swad_changelog.h
@@ -602,10 +602,11 @@ TODO: FIX BUG, URGENT! En las fechas como par
 
 TODO: En las encuestas, que los estudiantes no puedan ver los resultados hasta que no finalice el plazo.
 */
-#define Log_PLATFORM_VERSION	"SWAD 21.76.3 (2021-12-28)"
-#define CSS_FILE		"swad21.76.3.css"
+#define Log_PLATFORM_VERSION	"SWAD 21.76.4 (2021-12-28)"
+#define CSS_FILE		"swad21.76.4.css"
 #define JS_FILE			"swad21.67.4.js"
 /*
+	Version 21.76.4:  Dec 28, 2021  Working on design of dark theme. (322306 lines)
 	Version 21.76.3:  Dec 28, 2021  Working on design of dark theme. (322293 lines)
 	Version 21.76.2:  Dec 27, 2021  Working on design of dark theme. (322282 lines)
 Copy the following icons to icon public directory:
diff --git a/swad_link.c b/swad_link.c
index db39f0d5..6f5faa06 100644
--- a/swad_link.c
+++ b/swad_link.c
@@ -60,7 +60,7 @@ static struct Lnk_Link *Lnk_EditingLnk = NULL;	// Static variable to keep the li
 
 static void Lnk_PutIconsListingLinks (__attribute__((unused)) void *Args);
 static void Lnk_PutIconToEditLinks (void);
-static void Lnk_WriteListOfLinks (void);
+static void Lnk_WriteListOfLinks (const char *Class);
 
 static void Lnk_EditLinksInternal (void);
 static void Lnk_PutIconsEditingLinks (__attribute__((unused)) void *Args);
@@ -99,7 +99,7 @@ void Lnk_SeeLinks (void)
 
       /***** Write all links *****/
       if (Gbl.Links.Num)	// There are links
-	 Lnk_WriteListOfLinks ();
+	 Lnk_WriteListOfLinks ("class=\"LIST_LEFT\"");
       else			// No links created
 	 Ale_ShowAlert (Ale_INFO,Txt_No_links);
 
@@ -148,6 +148,7 @@ static void Lnk_PutIconToEditLinks (void)
 
 void Lnk_WriteMenuWithInstitutionalLinks (void)
   {
+   extern const char *The_Colors[The_NUM_THEMES];
    extern const char *Txt_Links;
 
    /***** Get list of links *****/
@@ -156,15 +157,16 @@ void Lnk_WriteMenuWithInstitutionalLinks (void)
    /***** Write all links *****/
    if (Gbl.Links.Num)
      {
-      HTM_DIV_Begin ("id=\"institutional_links\"");
+      HTM_DIV_Begin ("id=\"institutional_links\" class=\"INS_LNK_%s\"",
+                     The_Colors[Gbl.Prefs.Theme]);
 
 	 Frm_BeginForm (ActSeeLnk);
-	    HTM_BUTTON_OnSubmit_Begin (Txt_Links,"BT_LINK LINK_TITLE",NULL);
+	    HTM_BUTTON_OnSubmit_Begin (Txt_Links,"BT_LINK",NULL);
 	       HTM_TxtF ("%s",Txt_Links);
 	    HTM_BUTTON_End ();
 	 Frm_EndForm ();
 
-	 Lnk_WriteListOfLinks ();
+	 Lnk_WriteListOfLinks (NULL);
 
       HTM_DIV_End ();
      }
@@ -177,12 +179,13 @@ void Lnk_WriteMenuWithInstitutionalLinks (void)
 /*************************** Write list of links *****************************/
 /*****************************************************************************/
 
-static void Lnk_WriteListOfLinks (void)
+static void Lnk_WriteListOfLinks (const char *Class)
   {
+   extern const char *The_Colors[The_NUM_THEMES];
    unsigned NumLnk;
 
    /***** List start *****/
-   HTM_UL_Begin ("class=\"LIST_LEFT\"");
+   HTM_UL_Begin (Class);
 
       /***** Write all links *****/
       for (NumLnk = 0;
@@ -190,10 +193,12 @@ static void Lnk_WriteListOfLinks (void)
 	   NumLnk++)
 	{
 	 /* Write data of this link */
-	 HTM_LI_Begin ("class=\"INS_LNK\"");
-	    HTM_A_Begin ("href=\"%s\" title=\"%s\" class=\"INS_LNK\" target=\"_blank\"",
+	 HTM_LI_Begin ("class=\"ICO_HIGHLIGHT INS_LNK\"");
+	    HTM_A_Begin ("href=\"%s\" title=\"%s\""
+		         " class=\"INS_LNK_%s\" target=\"_blank\"",
 			 Gbl.Links.Lst[NumLnk].WWW,
-			 Gbl.Links.Lst[NumLnk].FullName);
+			 Gbl.Links.Lst[NumLnk].FullName,
+			 The_Colors[Gbl.Prefs.Theme]);
 	       HTM_Txt (Gbl.Links.Lst[NumLnk].ShrtName);
 	    HTM_A_End ();
 	 HTM_LI_End ();