style.css

@import url('https://fonts.googleapis.com/css2?family=Bree+Serif&family=Crimson+Pro:ital,wght@1,400;1,500&family=Lobster&family=Poppins:ital,wght@0,500;1,200&family=Roboto:wght@700&family=Rubik:ital,wght@1,500&family=Ysabeau+Office:ital,wght@1,1&display=swap');

*{
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Bree Serif', serif;
}
body{
    width: 100%;
    height:100vh;
    display: flex;
    justify-content: center;
    align-items: center;
    background: linear-gradient(45deg, rgb(4, 4, 4), rgb(87, 86, 86));
}
.calculator{
    border: 1px solid rgb(250, 249, 249);
    padding: 20px;
    border-radius: 23px;
    background: transparent;
    box-shadow: 0px 3px 15px rgb(244, 242, 242);
}
input{
    width:320px;
    border: none;
    padding: 24px;
    margin:12px;
    background: transparent;
    box-shadow: 2px 2px 5px rgb(250, 249, 249);
    font-size: 40px;
    text-align: right;
    cursor: pointer;
}
input::placeholder{
    color:rgb(13, 13, 13);

}
button{
    background: transparent;
    width: 60px;
    height: 60px;
    margin: 10px;
    font-size: 25px;
    box-shadow:2px 2px 5px white ;
    cursor: pointer;
}
.equal{
    background-color: rgb(112, 92, 67);
}
.operator{
    background-color:rgb(56, 46, 46);
}