message: Make back button a circle
diff: @@ -40,6 +40,7 @@ limitations under the License.
  width: 20px;
  margin: 12px;
  top: 0;
  + border-radius: 10px;
  &::before {
  content: "";
  @@ -55,7 +56,6 @@ limitations under the License.
  }
  .mx_BaseCard_back {
  - border-radius: 4px;
  left: 0;
  &::before {
  @@ -66,7 +66,6 @@ limitations under the License.
  }
  .mx_BaseCard_close {
  - border-radius: 10px;
  right: 0;
  &::before {
  