.cl-btn-7 {
    width: 20px;
    height: 20px;
    border-radius: 20px;
    position: relative;
    z-index: 1;
    margin: 10px auto;
    cursor: pointer;
}
.cl-btn-7:before {
    content: '+';
    color: #337AB7;
    position: absolute;
    z-index: 2;
    transform: rotate(45deg);
    font-size: 20px;
    line-height: 1;
    top: -5px;
    left: 6px;
    transition: all 0.3s cubic-bezier(0.77, 0, 0.2, 0.85);
}
.cl-btn-7:after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    border-radius: 100%;
    background: #337AB7;
    z-index: 1;
    transition: all 0.3s cubic-bezier(0.77, 0, 0.2, 0.85);
    transform: scale(0.01);
}
.cl-btn-7:hover:after {
    transform: scale(1);
}
.cl-btn-7:hover:before {
    transform: scale(0.8) rotate(45deg);
    color: #fff;
}