* {
    box-sizing: border-box;
}

body {
    margin: 0;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    font-family: Cambria, Cochin, Georgia, Times, 'Times New Roman', serif;
    background-image: linear-gradient(
        rgb(247, 32, 67),rgb(255, 209, 216)
    );
    height: 100vh;
}

.music-container {
    margin: 100px;
    position: relative;
    display: flex;
    background-color: rgb(240, 255, 240);
    border-radius: 15px;
    box-shadow: 0 20px 20px 0 rgb(105, 3, 3, 0.7);
    padding: 20px 30px;
}

.img-container {
    position: relative;
    width: 110px;
}

.img-container img {
    box-shadow: 0 4px 4px 3px rgba(0, 0, 0, 0.2);
    border-radius: 50%;
    height: 110px;
    width: 100%;
    position: absolute;
    bottom: 0;
    left: 0;
    animation: rotate 3s linear infinite;

    animation-play-state: paused;
}

.music-container.play .img-container img {
    animation-play-state: running;
}

@keyframes rotate {
    from {
        transform: rotate(0deg);
    }

    to {
        transform: rotate(360deg);
    }
}

.navigation {
    display: flex;
    align-items: center;
    justify-content: center;
}

.btn {
    cursor: pointer;
    margin: 0 20px;
    padding: 10px;
    border: 0;
    background-color: rgb(229, 250, 229);
    color: grey;
    font-size: 18px;
}

.btn.btn-big {
    font-size: 26px;
}

.btn:focus {
    outline: 0;
}

.btn:active {
    background-color: rgb(229, 250, 229,0.1);
}

.music-info {
    position: absolute;
    top: 0;
    left: 20px;
    width: calc(100% - 40px);
    padding: 10px 10px 10px 140px;
    border-radius: 15px 15px 0 0;
    background-color: rgba(255, 255, 240, 0.5);
    opacity: 0;
    transform: translateY(0);
    transition: transform 0.3s ease-in-out, opacity 0.3s ease-in-out;
    z-index: -1; 
}

.music-container.play .music-info {
    opacity: 1;
    transform: translateY(-100%);
    z-index: 0;
}

.music-info h4 {
    margin: 0;
}

.progress-container {
    cursor: pointer;
    width: 100%;
    background-color: white;
    height: 4px;
    border-radius: 5px;
    margin: 10px 0;
}

.progress {
    cursor: pointer;
    width: 0;
    height: 100%;
    border-radius: 5px;
    background-color: violet;
    transition: width 0.1s linear;
}