*{
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}
body{
    background: linear-gradient(45deg, #222831,#393E46,#948979);
}
#cal-main{
    width: 100vw;
    height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
}
#calculator{
    width: 20rem;
    height: 20rem;
    background: linear-gradient(to right, #273F4F, #94B4C1);
    border-radius: 10px;
    border: 1px solid rgb(115, 173, 240);
    box-shadow: 10px 10px 15px black ;
    /* background-color: #ECEFCA; */
}
#cal-input{
    border: 2px solid black;
    width: 18rem;
    height: 5rem;
    border-radius: 10px;
    margin: 15px auto;
}
#cal-input input{
    background-color: black;
    color: white;
    width: 100%;
    height: 100%;
    outline: none;
    border: none;
    text-align: right;
    font-size: xx-large;
    font-weight: 900;
}
#cal-btn{
    width: 18rem;
    margin: 5px auto;
}
#cal-btn button{
    width: 69px;
    height: 35px;
    font-size: large;
    font-weight: bold;
    border-radius: 5px;
    border: 1px solid black;
}
#cal-btn #equalTo{
    width: 141px;
}