body {
    background-color: #F3F3F3;
}

iframe.hexadecimal {
    width: 80%;
    height: 85vh;
    border-radius: 3rem;
    border: 1px solid black;
}

.app {
    display: flex;
    align-items: center;
    justify-content: center;
}

.app {
    margin-top: 4%;
    display: flex;
    align-items: flex-start;
}

.app::after {
    content: "";
    display: block;
    background: #F3F3F3;
    width: 23%;
    height: 8%;
    position: absolute;
    top: 0;
    right: 0;
}

.app {
    position: relative;
}