.stt-wrapper {
    position: relative;
}
.stt-start {
    position: absolute;
    top: 0;
    right: 0;
    display: none;
    width: 1.5rem;
    height: 1.5rem;
    padding: .25rem;
    line-height: 1rem;
    text-align: center;
    color: #666;
    content: " ";
    border-radius: 50%;
     vertical-align: middle;
    cursor: pointer;
    appearance: none;
    -webkit-user-select: none;
     -moz-user-select: none;
      -ms-user-select: none;
          user-select: none;
    background-color: transparent;
    border: 0 solid transparent;
}
.stt-start.enabled {
    display: block;
}
.stt-start.disabled {
    display: block;
    cursor: not-allowed;
    color: #ddd;
}
.stt-start.active {
    display: block;
    color: #fff;
    background-color: #f00;
}