style.css

.main{
    height: 700px;
    width: 100%;
    display: flex;
    justify-content: center;
    align-items: center;
}
.cal{
    height: 580px;
    width: 390px;
    background-color: white;
    background-color: rgb(13, 14, 14);
    border-radius: 50px;
    border: 5px solid grey;
}
input{
    height: 60px;
    width: 80px;
    margin: 10px;
    margin-left: 4px;
    border-radius: 80px;
    background-color: rgb(117, 115, 115);
    color: white;
    border: none;
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    font-weight: bold;
    font-size: 20px;
    transition-duration: 1s;
    
}
input:active{
    background-color: rgb(245, 245, 245);
    box-shadow: 0px 0px 10px rgb(164, 88, 88);
    transform: scale(1.0);
}
.op{
    height: 80px;
    width: 340px;
    background-color: azure;
    text-align: right;
    font-size: 40px;
    color: black;
    margin-bottom: 30px;
    margin-left: 23px;
    margin-top: 0px;
    border-radius: 30px;
}
.equal{
    padding-right: 170px;
    
}
.operator{
    background-color: rgb(255, 187, 0);
}