styles.css

*{
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}
html{
    font-size: 14px;
}
body{
    font-family: 'Open Sans', sans-serif;
    height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
    background-color: rgb(34, 41, 41);
    color: white;
}
@media (max-width:450px) {

}
#container{
    position: relative;
    width: 20%;
    background-image: url(images/music.png);
    background-size: cover;
    background-position: center;
    background-repeat: no-repeat;
    border-radius: 20px;
    text-align: center;
}
#container::before{
    background-color: rgba(0, 0, 0, 0.951);
    border-radius: 18px;
    content: " ";
    position: absolute;
    width: 100%;
    height: 100%;
    display:inline-block;
    top: 0;
    left: 0;
    z-index: 1;
}

@media (max-width:1024px) {
    #container{
        width: 40%;
    }
}
/* width setting for mobile device */
@media (max-width:450px) {
    #container{
        width: 80%;
    }
}
h1{
    position: relative;
    padding-top: 5px;
    padding-bottom: 5px;
    z-index: 2;
}
#img{
    position: relative;
    width: 100%;
    z-index: 2;
}
img{
    width:80%;
    border-radius: 50%;
    border: white 2px;
}
#title{
    position: relative;
    z-index: 2;
}
#music_time{
    position: relative;
    display: flex;
    justify-content: center;
    z-index: 2;
    font-size: 0.8rem;
}
/* .rotate{
    animation: rotate 3s linear infinite;
}
@keyframes rotate {
    from{
        transform: rotate(0deg);
    }
    to{
        transform: rotate(360deg);
    }
} */
/* my default range setting */
.slider {
    position: relative;
    z-index: 2;
    -webkit-appearance: none;
    height: 5px;
    border-radius: 10px;
    background: white;
    outline: none;
    opacity: 0.7;
    -webkit-transition: .2s;
    transition: opacity .2s;
}
.slider:hover{
    opacity: 1;
}
.slider::-ms-thumb{
    width: 10px;
    height: 10px;
    border: none;
    background:rgb(145, 143, 143);
    cursor: pointer;
    border-radius:50%;
}
.slider::-moz-range-thumb {
    width: 10px;
    height: 10px;
    border: none;
    background:rgb(145, 143, 143);
    cursor: pointer;
    border-radius:50%;
}
.slider::-webkit-slider-thumb{
    width: 10px;
    height: 10px;
    border: none;
    background-color:rgb(145, 143, 143);
    cursor: pointer;
    border-radius:50%;
}
#range{
    margin-left: 10px;
    margin-right: 10px;
    width:65%;
    align-self: center;
}
#music_functions{
    position: relative;
    display: flex;
    justify-content: center;
    z-index: 2;
}
.function{
    display: flex;
    align-items: center;
}
#prev{
    font-size: 3rem;
    margin:0px 6px;
    transition: color .3s;
}
#prev:hover{
    color: rgb(145, 143, 143);
}
#prev:active{
    color:black;
}
#play_pause{
    font-size: 5rem;
    margin:0px 6px;
    transition: color .3s;
}
#play_pause:hover{
    color: rgb(145, 143, 143);
}
#play_pause:active{
    color:black;
}
#next{
    font-size: 3rem;
    margin: 0px 6px;
    transition: color .3s;
}
#next:hover{
    color: rgb(145, 143, 143);
}
#next:active{
    color:black;
}
#volume{
    position: relative;
    z-index: 2;
    display: flex;
    justify-content: center;
    margin-bottom: 10px;
    font-size: 1.5rem;
}
#vol{
    align-self: center;
    margin-left: 10px;
    margin-right: 10px;
}