Added actor expand button to profile.

assets/css/style.scss

@@ -37,3 +37,56 @@ body {
         fill: $primary;
     }
 }
+
+.expand {
+    display: flex;
+    justify-content: center;
+    align-items: center;
+    padding: .5rem 0;
+    font-weight: bold;
+    font-size: .9rem;
+    cursor: pointer;
+
+    .icon {
+        fill: $shadow;
+    }
+
+    &:hover {
+        background: $shadow-hint;
+
+        .icon {
+            fill: $shadow-strong;
+        }
+    }
+}
+
+.expand-sidebar:hover {
+    background: $shadow-hint;
+}
+
+.expand-header {
+    display: none;
+
+    &:hover {
+        background: $shadow-hint;
+    }
+}
+
+.collapse-header {
+    width: 100%;
+    justify-content: center;
+    align-items: center;
+    padding: 0;
+    background: $profile;
+
+    .icon {
+        width: 100%;
+        fill: $highlight;
+        padding: .5rem 0;
+    }
+
+    &:hover .icon {
+        background: $highlight-hint;
+        fill: $text-contrast;
+    }
+}