.cl4-hidden {
    max-height: 220px;
    overflow: hidden;
    position: relative;
}
.cl4-hidden:after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 100%;
    height: 80px;
    background: linear-gradient(to bottom, transparent, #ffffff);
}
.cl4-btn {
    color: #ffffff;
    border: none;
    cursor: pointer;
    font-size: 16px;
    margin-top: 12px;
    display: block;
    text-align: center;
    border-radius: 4px;
}