html,
body {
    background-color: rgb(128, 128, 128);

    /* reset */
    margin: 0;
    padding: 0;
    border: 0;
    outline: 0;
    box-sizing: border-box;
}

.centerColumn {
    display: flex;
    flex-direction: column;
    align-items: center;
}

.imageOfTutu {
    border-radius: 50px;
    border: 1px solid rgba(255, 255, 255, 0.51);

    margin-top: calc(20vh);
}

.name {
    margin: 70px 0 20px 0;
    font-size: 20px;
    font-family: Kai, "Kaiti SC", STKaiti;
    color: rgba(255, 255, 255, 0.7);
}

.imageOfRabbitGuard {
    position: fixed;
    left: 4px;
    bottom: 12px;
    border-radius: 16px;
}

.pageOfIndex {
    justify-content: space-around;
}

.buttonToEnter {
    margin-top: calc(20vh);
    font-family: 'Courier New', 'Courier', monospace;
    color: rgba(255, 255, 255, 0.65);
    font-size: 1em;
    letter-spacing: 4px;
}

.label {
    user-select: none;
    cursor: pointer;
}

.buttonToLeave {
    position: fixed;
    left: 4px;
    top: 4px;

    border: 1px solid rgba(255, 255, 255, 0.51);
    border-radius: 2px;
    padding: 1em 0.2em 1em 0.2em;
    color: rgba(255, 255, 255, 0.65);
    font-size: 1em;
}