[Glitch] Change single-column mode to scroll the whole page

Port aa22b38fdb to glitch-soc

Signed-off-by: Thibaut Girka <thib@sitedethib.com>

app/javascript/flavours/glitch/styles/basics.scss

@@ -7,7 +7,7 @@
 
 body {
   font-family: $font-sans-serif, sans-serif;
-  background: darken($ui-base-color, 8%);
+  background: darken($ui-base-color, 7%);
   font-size: 13px;
   line-height: 18px;
   font-weight: 400;
@@ -34,11 +34,19 @@ body {
   }
 
   &.app-body {
-    position: absolute;
-    width: 100%;
-    height: 100%;
     padding: 0;
-    background: $ui-base-color;
+
+    &.layout-single-column {
+      height: auto;
+      min-height: 100%;
+      overflow-y: scroll;
+    }
+
+    &.layout-multiple-columns {
+      position: absolute;
+      width: 100%;
+      height: 100%;
+    }
 
     &.with-modals--active {
       overflow-y: hidden;
@@ -55,7 +63,6 @@ body {
 
     &--active {
       overflow-y: hidden;
-      margin-right: 13px;
     }
   }
 
@@ -124,7 +131,6 @@ button {
   & > div {
     display: flex;
     width: 100%;
-    height: 100%;
     align-items: center;
     justify-content: center;
     outline: 0 !important;