* {
    margin: 0;
    padding: 0;
}

:root {
    --color-font: #000000;
    --color-bg-progress-b: #6b6b6b;
    --color-bg-progress-l: #a0a0a0;
    --color-bg-progress-m: #ffffff;
}

.m-img-box {
    flex: none;
    width: 5vw;
    height: 5vw;
    border-radius: 2rem;
    overflow: hidden;
    box-shadow: 0px 0px 10px 0px rgba(255, 255, 255, 0.25),
        0px 0px 8px 0px inset rgba(0, 0, 0, 0.05);
}

.m-img-content {
    width: 100%;
    height: 100%;
    transform: translateY(-100%);
}

.m-img-content.tran {
    transition: transform 0.4s linear 0.3s;
}

.m-img-content>img {
    display: block;
    width: 100%;
    height: 100%;
    object-fit: cover;
    border-radius: -.5rem;
    transform: scale(1);
}

.m-img-content>img.anim {
    animation: img-anim 1s linear forwards;
}

@keyframes img-anim {
    30% {
        transform: scale(0.6);
    }

    70% {
        transform: scale(0.6);
    }

    100% {
        transform: scale(1);
    }
}
/* music-box 下部分 */
.music-box>section {
    width: 100%;
    font-size: 16rem;
    font-weight: 700;
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0 5rem;
    box-sizing: border-box;
}

.m-progress-bar {
    width: 25vw;
    height: .8vw;
    background-color: var(--color-bg-progress-b);
    border-radius: 3rem;
    overflow: hidden;
}

.m-progress-main {
    float: left;
    height: 100%;
    width: 20%;
    background-color: var(--color-bg-progress-m);
    display: flex;
    justify-content: flex-end;
    align-items: center;
}

.m-progress-btn {
    position: absolute;
    transform: translateX(50%);
    width: 1.1vw;
    height: 1.1vw;
    border-radius: 50%;
    background-color: var(--color-bg-progress-m);
    transition: width 0.1s linear, height 0.1s linear;
}

.m-progress-btn:active {
    width: 1.5vw;
    height: 1.5vw;
}
.m-progress-btn:hover {
    width: 1.5vw;
    height: 1.5vw;
}
.m-progress-load {
    height: 100%;
    width: 50%;
    background-color: var(--color-bg-progress-l);
}

.m-btn-box {
    display: flex;
    justify-content: center;
}

.m-btn-box>button {
    background: none;
    border: none;
    outline: none;
    width: 2.2rem;
    height: 2.2rem;
}

.icon {
    width: 100%;
    height: 100%;
    vertical-align: middle;
    fill: var(--color-font);
    overflow: hidden;
}

.m-btn-box>button:active>.icon {
    width: 3.0rem;
    height: 3.0rem;
}