style.css

body{
    background-color: rgb(214,214,214);

}
.container{
    width: 250px;
    height: 400px;
    margin: 80px auto;
    border-radius: 10px;
    background:rgb(214,214,214);
    box-shadow:5px 5px 10px #b6a9a9, -5px -5px 10px #ffffff;

}
.cal-box{
    width: 200px;
    margin: 20px auto;
}

#display{
    border:none;
    outline: none;
    color: black;
    text-align: right;
    font-weight: 600;
    padding: 15px;
    margin: 30px 0 20px 0;
    background: transparent;
    box-shadow: inset 2px 2px 5px #babecc,inset -5px -5px 10px #ffffff;
}
.button{
    margin:15px 0 0 5px;
    width: 42px;
    height: 42px;
    border: none;
    outline: none;
    font-size: 18px;
    font-weight: bold;
    cursor: pointer;
    border-radius: 8px;
    background: rgb(214,214,214);
    box-shadow: 5px 5px 10px #babecc, -5px -5px 10px #faf4f4;
    display: inline-block;



}
.button:active{
    box-shadow: inset 1px 1px 2px #babeec,inset -1px -1px 2px #ffffff;
}
.clearButton{
    background:red;
    color: white;

}
.mathbutton{
    background: black;
    color: white;
}