*{
    padding: 0;
    margin: 0;
    box-sizing: border-box;
}

.main-container{
    background-color: #1b1919;
    height: 100vh;
    width: 100vw;
    position: relative;
}

.main-calculator{
    overflow: hidden;
    position: absolute;
    left: 50%;
    top: 50%;
    transform: translate(-50%, -50%);
    border-radius: 10px;
    padding: 15px;
    background-color: black;
}

.display-input{
    width: 100%;
    padding: 25px;
    font-size: 23px;
    border: none;
    outline: none;
    border-radius: 10px;
    background-color: rgb(38, 43, 43);
    color: white;
}

.buttons{
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    margin-top: 10px;
}

.equal{
    grid-row: span 3;
    background-color: rgb(212, 170, 17) ;
    border-radius: 10px;
    color: black;
}

.operator, .clear, .all-clear{
    color: rgb(212, 170, 17) ;
}

button{
    padding: 18px;
    font-size: 20px;
    border: none;
    background-color: black;
    color: white;
    text-align: center;
    transition: 0.3s;
}

.number:hover{
    color: rgb(212, 170, 17);
}

.equal:hover{
    color: rgb(212, 170, 17);
    background-color: rgb(38, 43, 43);
}