style.css

.container{
    height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
}
input{
    display: grid;
    grid-column: span 4;
    height: 100px;
    width: 260px;
    border-radius: 12px;
    border: none;
    background: black;
    color: white;
    font-size: xx-large;
    text-align: end;
}
.calculator{
    display: grid;
    grid-template-columns: repeat((4,2fr));
    border: 1px solid #565151;
    border-radius: 2px;
    padding: 12px;
    height:  450px;
    background: black;
    box-shadow: 0px -1px 5px 0px #5a5a5a, 0px 2px 5px 2px black;

}
button{
    border-radius: 27px;
    border: none;
    height: 59px;
    width: 58px;
    font-size: x-large;
}
.first{
    background: rgb(167 177 223);
}
.symbol{
    background: rgb(255 191 0);
}
button:active{
    background: rgb(144 144 199);

}