body {
    margin: 0;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    height: 100vh;
}

.background {
    min-height: 100vh;
    width: 100%;
    background-color: black;
    position: relative;
    overflow: hidden;
    display: flex;
    justify-content: center;
    align-items: center;
}

.background::before {
    content: "";
    position: absolute;
    inset: 0;
    z-index: 0;
    background-image:
        radial-gradient(circle at 50% 100%, rgba(70, 85, 110, 0.5) 0%, transparent 60%),
        radial-gradient(circle at 50% 100%, rgba(99, 102, 241, 0.4) 0%, transparent 70%),
        radial-gradient(circle at 50% 100%, rgba(181, 184, 208, 0.3) 0%, transparent 80%);
}

.content {
    position: relative;
    z-index: 1;
    color: white;
    text-align: center;
    padding: 20px;
}

.container {
    font-family: Arial, Helvetica, sans-serif;
    background-color: rgb(6, 6, 6);
    border-radius: 17px;
    overflow: hidden;
    max-width: 500px;
    box-shadow: 15px 13px 10px black;
}

#displayNums {

    padding: 10px;
    font-size: 2.8rem;
    background-color: rgb(19, 19, 19);
    border: none;
    text-align: left;
    color: white;
}

#displayNums::placeHolder {
    color: white;
}

#keys {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 10px;
    padding: 25px;

}

#keys button {
    width: 100px;
    height: 100px;
    border-radius: 50px;
    font-size: 2.6rem;
    color: white;
    background-color: rgb(53, 53, 53);
    border: none;
    cursor: pointer;
}

#keys .orangeBtns {
    background-color: rgb(237, 155, 1);
}

#keys .greyBtns {
    background-color: rgb(109, 109, 109);
}

#keys button:hover {
    background-color: rgb(42, 42, 42);
    ;
}

#keys .orangeBtns:hover {
    background-color: rgb(210, 137, 2);
}

#keys .greyBtns:hover {
    background-color: rgb(87, 87, 87);
}