feat: Add animation for disable multiple selection

frontend/src/css/listing.css

@@ -12,10 +12,8 @@
 
 #listing>div {
   display: flex;
-  padding: 0;
   flex-wrap: wrap;
   justify-content: flex-start;
-  position: relative;
 }
 
 #listing .item {
@@ -207,16 +205,6 @@
   font-weight: bold;
 }
 
-@keyframes slidein {
-  from {
-    bottom: -4em;
-  }
-
-  to {
-    bottom: 0;
-  }
-}
-
 #listing #multiple-selection {
   position: fixed;
   bottom: -4em;
@@ -225,16 +213,13 @@
   width: 100%;
   background-color: var(--blue);
   height: 4em;
-  display: none;
   padding: 0.5em 0.5em 0.5em 1em;
   justify-content: space-between;
-  align-items: center;
   transition: .2s ease bottom;
 }
 
 #listing #multiple-selection.active {
-  animation: slidein 0.2s forwards;
-  display: flex;
+  bottom: 0;
 }
 
 #listing #multiple-selection p,