style.css

*{

    margin: 0;
    padding: 0;
}

body{
    
    background-color: #f1f1f1;
}

.calculatorBody{

    position:absolute;
    top: 50%;
    left:50%;
    transform: translate(-50%, -50%);
    height: 600px;
    width: 500px;
}

table{

    background-color: #fff;
    box-shadow: rgba(0, 0, 0, 0.35) 0px 5px 15px;
    border: 2px solid black;
    
}

td{

    text-align: center;
    color: #fff1;
    border: 2px solid black;
}

input[type="button"]{

    width: 90px;
    height: 80px;
    color: #fff;
    border-radius: 5px;
    font-size: 2rem;
    cursor: pointer;
    transition: 0.2 ease-in-out;
    background-color: black;
    border: none;

}
input[type="button"]:hover{

    background-color: aquamarine;
}
input[type="text"]{

    width: 340px;
    height: 80px;
    text-align: right;
    margin: 10px;
    padding: 2px;
    font-size: 30px;
}