.btn-audio {
    width: 100%;
    height: 5.2rem;
    border: 1px solid #ebebeb;
    background-color: #fdfdfd;
    margin-bottom: 1rem;
    margin-top: 1rem;
    position: relative;
}

.mp3Box {
    width: 2.8rem;
    height: 2.8rem;
    position: absolute;
    top: 1.2rem;
    left: 1.2rem;
    background: url("image/close.png") no-repeat center bottom;
    background-size: cover;
    z-index: 100;
}