.cts-button {
    display: block;
    position: fixed;
    bottom: 30px;
    right: 30px;
    -webkit-transition: all 0.3s;
    -moz-transition: all 0.3s;
    -ms-transition: all 0.3s;
    -o-transition: all 0.3s;
    transition: all 0.3s;
    opacity: 0;
    visibility: hidden;
    z-index: 9999;
}

.cts-button.active {
    opacity: 1;
    visibility: visible;
}

.cts-button:focus {
    outline: none;
    -webkit-box-shadow: none;
    -moz-box-shadow: none;
    box-shadow: none;
}

.cts-button-icon {
    position: absolute;
    left: 50%;
    top: 50%;
    width: 0;
    height: 0;
    -webkit-transition: border-color 0.3s;
    -moz-transition: border-color 0.3s;
    -ms-transition: border-color 0.3s;
    -o-transition: border-color 0.3s;
    transition: border-color 0.3s;
}

.cts-button-image {
    max-width: 150px;
}

.cts-button-image img {
    max-width: 100%;
}