body{
    font-family: Courier New;
    background: #E3E3E4;
    color: black;
    border: black 5px solid;
    border-radius: 10px;
    position: fixed;
    height: 100%
    }
    #head{
    text-align: center;
    }
    table{
    width: 100%;
    height: 100%;
    border: black;
    }
    #btn{
    color: black;
    background: #686868;
    border: 0.5px black solid;
    width: 80px;
    height: 80px;
    font-size: medium;
    }
    #btn:hover{
    background: blue;
    }
    #output{
    font-size: 50px;
    float: right;
    }
    #output{
    width: 96%;
    
    background: #686868;
    color: black;
    float: right;
    height: 70px;
    text-align: right;
    margin: auto;
    margin-right:4px;
    }
    .light{
    background: black;
    border: white 5px solid;
    font-family: Courier New;
    color: white;
    }
    .btn{
    color: black;
    background: #eee;
    border: 0.5px black solid;
    width: 80px;
    height: 80px;
    font-size: 5px;
    }