.bk-btn {
    height: 52px;
    width: 52px;
    background-color: wheat;
    border-radius: 50%;
    margin-top: 8px;
    opacity: 1;
    -webkit-transition: background-color 1s ease-out;
    -moz-transition: background-color 1s ease-out;
    -o-transition: background-color 1s ease-out;
    transition: background-color 1s ease-out;
}

    .bk-btn:hover {
        background-color: black;
        opacity: 0.7;
        cursor: pointer;
    }


    .bk-btn .bk-btn-triangle {
        position: relative;
        top: 13px;
        left: 10.4px;
        width: 0;
        height: 0;
        border-top: 13px solid transparent;
        border-bottom: 13px solid transparent;
        border-right: 13px solid #cc5350;
    }

    .bk-btn .bk-btn-bar {
        position: relative;
        background-color: #cc5350;
        height: 7.8px;
        width: 13px;
        top: -3.64px;
        left: 22.88px;
    }