fix: various menu fixes & improvements

src/styles/admin-circles/_index.scss

@@ -1,6 +1,61 @@
 #admin-circles,
 #admin-circles-leave {
 
+  /* Fix on Join button in admin (circles + projects) */
+  /* Styles on buttons and .children-link don't work because this input is inside too many elements. */
+  /* And no I can't add that stupid icon because it'a an input. */
+  /* But now, with 0.16, it's a button and you can :D */
+  .join-button {
+  
+    input,
+    button {
+      padding: 9px 20px;
+      border-radius: 16.5px;
+      height: 33px;
+      text-decoration: none;
+      font-weight: bold;
+      text-transform: uppercase;
+      background-color: var(--color-secondary);
+      color: white;
+      border: 1px solid var(--color-secondary);
+  
+      &:before {
+        font-size: 15px;
+        margin-right: 6px;
+        content: "\e079";
+        font-family: simple-line-icons;
+        font-style: normal;
+        font-weight: 400;
+        speak: none;
+        display: inline-block;
+        text-decoration: inherit;
+        width: 1em;
+        text-align: center;
+        font-variant: normal;
+        text-transform: none;
+        line-height: 1em;
+        -webkit-font-smoothing: antialiased;
+        -moz-osx-font-smoothing: grayscale;
+      }
+  
+      &:hover {
+        background: white;
+        color: var(--color-secondary);
+      }
+    }
+  
+    @media (max-width: 768px) {
+  
+      &.sm-full {
+  
+        input,
+        button {
+          width: 100%;
+        }
+      }
+    }
+  }
+
   .form.search-button :not(.add-member)+button[type=submit] {
     background-color: #E9F2FF;
     border: none;