:root{
    --bg_color : #03203C ;
    --text_color : #00fff1 ;
}
*{
    margin: 0px;
    padding: 0px;
    font-family: 'Gill Sans', 'Gill Sans MT', Calibri, 'Trebuchet MS', sans-serif;
}
body{
   background-color: var(--bg_color);
   padding: 40px 10px;
    /* background:rgba(255, 255, 255, 0.1) ; */
   
}
.main{

    text-align: center;
    border: 3px solid aqua;
   padding: 20px 10px;
   
}
.heading{
    font-size: 70px;
    color: var(--text_color);
    margin: 50px 0px;
}
.drum_btn{
    height: 150px;
    width: 150px;
    font-size: 70px;
    border: none;
    box-shadow: -1px -1px 3px rgba(255, 255, 255, 0.1) , 1px 1px 3px rgba(0, 0, 0, 0.8);
    background-color: var(--bg_color);
    color: var(--text_color);
}
.s , .j , .l{
    border-radius: 50%;
    margin: 20px;
}

/* Or, .drum_btn.btn_pressed instead of  */
 .btn_pressed{     /*  this class is add through js */
    opacity: 0.5;
    box-shadow: -1px -1px 3px var(--bg_color);  
}

.volum{
    margin: 50px 0px;
    display: flex;
    justify-content: center;
    align-items: center;
}

#volume_slider{
    appearance: none;
    background-color: var(--text_color);
    height: 7px;
    border-radius: 6px;
    margin-left: 10px;
}
#volume_slider::-webkit-slider-thumb{
    appearance: none;
     width: 20px;
     height: 20px;
     border-radius: 50%;
     background-color:var(--text_color);
}
.icon{
    color: var(--text_color);
   
}
.last_btns{
    margin-top: 20px;
}
#auto{
   border-radius: 2px;
   border: none;
    font-size: 23px;
    color: var(--text_color);
    font-family: Verdana, Geneva, Tahoma, sans-serif;
    padding: 12px 30px;
    background-color: var(--bg_color);
    box-shadow: -1px -1px 3px rgba(255, 255, 255, 0.1) , 1px 1px 3px rgba(0, 0, 0, 0.8);
    cursor: pointer;
    margin-bottom: 50px;
}
#auto:hover{
    color: var(--bg_color);
    background-color: var(--text_color);
    transition: 0.4s;
}