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

html {
    height: 100%;
    width: 100%;

    background-image: linear-gradient(to bottom right, red, yellow);
}

.flexBox {
    margin: 30vh 0 30vh 0;
    display: flex;

    align-items: center;
    flex-direction: column;
}

.flexBox input {
    margin: 5px;
}