Convert jump to unread button

res/css/views/rooms/_TopUnreadMessagesBar.scss

@@ -51,11 +51,11 @@ limitations under the License.
     position: absolute;
     width: 36px;
     height: 36px;
-    mask-image: url('$(res)/img/icon-jump-to-first-unread.svg');
+    mask-image: url('$(res)/img/feather-customised/chevron-down-thin.svg');
     mask-repeat: no-repeat;
-    mask-position: center;
-    mask-size: 50%;
+    mask-size: contain;
     background: $muted-fg-color;
+    transform: rotate(180deg);
 }
 
 .mx_TopUnreadMessagesBar_markAsRead {

res/img/icon-jump-to-first-unread.svg

@@ -1,16 +0,0 @@
-<?xml version="1.0" encoding="UTF-8" standalone="no"?>
-<svg
-   xmlns:svg="http://www.w3.org/2000/svg"
-   xmlns="http://www.w3.org/2000/svg"
-   style="fill:none"
-   version="1.1"
-   viewBox="0 0 18.666187 8.7375818"
-   height="8.7375822"
-   width="18.666187">
-  <defs
-     id="defs8" />
-  <path
-     d="M 17.909095,7.981591 9.3330939,0.74997995 0.75709259,7.981591"
-     style="fill:none;stroke:#000000;stroke-width:1.29999995;stroke-linecap:round;stroke-linejoin:round;stroke-miterlimit:4;stroke-dasharray:none;stroke-opacity:1"
-     id="path2-8-3" />
-</svg>