calc.css

*{
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Poppins',sans-serif ;
}

.container{
    background: #e3f9ff;
    height: 100vh;
    width: 100%;
    display: flex;
    justify-content: center;
    align-items: center;
}

.calculator{
    background: #305353;
    padding: 20px;
    border-radius: 10px;
    
}

.calculator form input{
    border: 0;
    outline: 0;
    border-radius: 10px;
    width: 60px;
    height:60px;
    box-shadow: 5px 3px 4px #ac9999 , -5px 3px 4px #0e0d0d;;
    background: transparent;
    font-size: 20px;
    color: #fff;
    cursor: pointer;
    margin: 10px;
}

form .display{
    display: flex;
    justify-content: flex-end;
    margin: 20px 0;
}

.buttons{
    border: #386161 solid;
    background-color: #386161;
    border-radius: 10px;
    padding: 5px;
}

form .display input{
    flex: 1;
    text-align: right;
    font-size: 40px;
    box-shadow: none;
}

form input.equal{
    width: 145px;
}

form input.operators{
    color: rgb(252, 135, 26);
}