Designs: Fix on mobile (fix #985)

designs/galkaev/adminer-dark.css

@@ -692,6 +692,7 @@ legend{
 	padding: 0;
 	top: 0;
 	overflow-y: overlay;
+	z-index: 1;
 }
 
 #menu p {

designs/lucas-sandery/adminer.css

@@ -364,7 +364,7 @@ tbody tr:nth-child(n):hover th {
 }
 .icon {
 	width: 1.2em;
-	background: #4c3957 center no-repeat;
+	background-color: #4c3957;
 	background-size: 66%;
 }
 .icon-plus {
@@ -497,7 +497,7 @@ button,
 	display: inline-block;
 	font-size: 85%;
 	text-align: center;
-	background: #4c3957;
+	background-color: #4c3957;
 	color: #fff;
 	padding: 0.5em 0.8em 0.6em;
 	margin: 0;
@@ -517,7 +517,7 @@ button:focus,
 .links a:link:focus,
 .links a:visited:focus {
 	color: #fff;
-	background: #ec5f12;
+	background-color: #ec5f12;
 	text-decoration: none;
 }
 input[type="submit"]:disabled,

designs/mancave/adminer-dark.css

@@ -726,6 +726,10 @@ legend{
 /* menu
    ----------------------------------------------------------------------- */
 
+#foot{
+	height: 100%;
+}
+
 #menu{
 	height: 100%;
 	width: 300px;
@@ -739,6 +743,7 @@ legend{
 	top: 0;
 	overflow-y: overlay;
     overflow-y: auto; /* needed for firefox 2017-03-05 */
+	z-index: 10;
 }
 
 #menu p {