calc.css

body{
    background-image: linear-gradient( to right, 
    
#fc00ff
,
#00dbde);
}
#heading{
     
    color:black;
    font-size: 40px;
    font-weight: bold;
    text-shadow: 6px 4px 3px purple;
}
#answerBox{
    width: 320px;
    height: 70px;
    border-radius: 10px;
    box-shadow: inset 3px 3px 5px violet,inset -3px -3px 5px black;   
}
.calcButtons{

    background-image: linear-gradient( to right, 
    #0f0c29
    ,
    #302b63
    ,
    #24243e);
    padding: 10px;
    display: inline-block;
    border-radius: 15px;
    box-shadow: 2px 2px 10px darkslategrey, -2px -2px 20px darkslategray;
}
input{
    font-size: 30px;
    color: white;
    font-family: 'Times New Roman', Times, serif;
    font-weight: bold;
    width: 70px;
    height: 50px;
    margin: 5px;
    border-radius: 20px;
    border: none;
    box-shadow: 3px 3px 5px purple, -3px -3px 5px violet;   
    background-image: linear-gradient( to right, 
    #0f0c29
    ,
    #302b63
    ,
    #24243e);
    outline: none;
}

input:hover{
    box-shadow: inset  3px 5px 5px purple,inset -3px -3px 5px violet;   
    cursor: pointer;
    background-color: lightcyan;
}