* {
    box-sizing: border-box;
}

html,
body {
    width: 100%;
    height: 100%;
    overflow: hidden;
}

.wrapper {
    width: 100%;
    height: 100%;

    display: flex;
    justify-content: center;
    align-items: center;
    flex-direction: column;
}

#timer {
    font-family: monospace;
    font-size: 100px;
    font-weight: bold;
}

.line {
    width: 100%;
    height: 1px;
    background-color: gray;
    margin: 100px;
}