.caption-button{
  outline: none;
}
.caption-button:before {
    display: inline-block;
    font-style: normal;
    font-variant: normal;
    text-rendering: auto;
    content: "\f20a";
    font-size: 1.5em;
    line-height: 1.0em;
    font-family: "Font Awesome\ 5 Free";
    font-weight: 900;
    opacity: 0.3;
}
.caption-button-active:before {
    opacity: 1;
}