style.css

@import url('https://fonts.googleapis.com/css?family=Lato&display=swap');

*{
    box-sizing: border-box;
}

body{
    height: 100vh;
    margin: 0;
    font-family: 'Lato', sans-sarif;
    background-image: linear-gradient(0deg,rgb(247,247,247) 23.8%, rgb(252,221,221) 92%);
    display:flex;
    flex-direction:column;
    align-items: center;
    justify-content:center;
}

.music-container{
    background-color: #fff;
    border-radius:15px;
    box-shadow: 0 20px 0 rgba(252,169,169, 0.6);
    display:flex;
    padding: 20px 30px;
    position: relative;
    margin: 100px 0;
    z-index:10;

}

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

.img-container::after{
    content: '';
    background-color: #fff;
    height: 20px;
    width: 20px;
    position: absolute;
    left:50%;
    bottom:50%;
    border-radius:50%;
    transform: translate(-50%, -50%);
}
.img-container img{
    width: inherit;
    height: 110px;
    border-radius: 50%;
    object-fit: cover;
    position: absolute;
    bottom: 0;
    left: 0;
    animation: rotate 3s linear infinite;
    animation-play-state: paused;
}
/*
for making the animation run when we add play class to the music-contianer   read more
*/
.music-container.play .img-container img{
    animation-play-state: running;
} 
@keyframes rotate{
    from{
        tranform: rotate(0deg);
    }
    to{
        transform: rotate(360deg);
    }
}

.navigation{
    display:flex;
    align-items: center;
    justify-content: center;
    z-index: 1;
}

.action-btn{
    background-color: #fff;
    border: 0px;
    color: #dfdbdf;
    font-size: 20px;
    cursor:pointer;
    padding:10px;
    margin: 0 20px;
}

.action-btn-big{
    color: #cdc2d0;
    font-size:30px;
}
/*
used because dont want any box around buttons when we play them*/
.action-btn:focus{
    outline: 0;
}

.music-info{
    background-color: rgba(255,255,255,0.5);
    border-radius: 15px 15px 0 0;
    position: absolute;
    top: 0;
    left: 20px;
    width: calc(100% - 40px);/* read this*/
    opacity: 0;
    transform: translateY(0%);
    padding: 10px 10px 10px 150px;
    transition: tranform 0.3s ease-in, opacity 0.3s ease-in;
    
}

.music-info h4{
    margin:0;
}
/*again this will turn uo when we also add play class*/
.music-container.play .music-info{
    opacity: 1;
    transform: translateY(-100%);
}
.progress-container{
    background: #fff;
    border-radius: 5px;
    cursor: pointer;
    margin: 10px 0;
    height: 4px;
    width: 100%;
}
.progress{
   background-color: #fe8daa;
   border-radius: 5px; 
   height: 100%;
   width: 0%;
   transition: width 0.1s linear;;
}