Fix the safari rendering of the sound editor

src/components/sound-editor/sound-editor.css

@@ -49,7 +49,7 @@ $border-radius: 0.25rem;
     transition: 0.2s;
 }
 
-.button img {
+.button > img {
     flex-grow: 1;
     max-width: 100%;
     max-height: 100%;
@@ -62,6 +62,10 @@ $border-radius: 0.25rem;
     padding-right: 10px; /* To equalize with empty whitespace from image on left */
 }
 
+.trim-button > img {
+    width: 1.5rem;
+}
+
 .trim-button-active {
     filter: hue-rotate(155deg); /* @todo replace blue -> red with real submit icon */
 }