Add minimum width to buttons

This ensures they aren't too small, even if the text label is short.

app/styles/base.css

@@ -387,6 +387,7 @@ html {
 
 /* Control bar buttons */
 #noVNC_control_bar .noVNC_button {
+    min-width: unset;
     padding: 4px 4px;
     vertical-align: middle;
     border:1px solid rgba(255, 255, 255, 0.2);

app/styles/input.css

@@ -176,6 +176,7 @@ input[type=submit],
 input::file-selector-button,
 button,
 select {
+    min-width: 8em;
     border: none;
     color: black;
     font-weight: bold;