rosa-build/public/stylesheets/web-app-theme/override.css

/* Override here any style defined by web-app-theme */
.form input.file_field:hover {
  -webkit-box-shadow: rgba(0,0,0,0.0) 0 0 0px;
  -moz-box-shadow: rgba(0,0,0,0.0) 0 0 0px;
  box-shadow: 0 0 0px rgba(0, 0, 0, 0.0);
  border: 0px solid #a2a294;
}

button.search {
  height:2em;
  line-height:2em;
}