* {
    font-family: Arial, Helvetica, sans-serif;
}

html, body {
    background-color: #fff;
    border: 0;
    margin: 0;
    padding: 0;
}

body {
    height: 100vh;
}

main {
    display: flex;
    flex-direction: column;
    height: calc(100% - 40px);
    justify-content: center;
    margin: auto;
    padding: 20px;
    width: 50%;
}

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

.header-text {
    font-size: 3.5em;
    font-weight: 700;
}

.notice-content {
    font-size: 1.2em;
    margin: 0px auto;
    text-align: center;
    width: 50%;
}

@media (max-width: 600px) {
    main {
        padding: 20px 0;
        width: 80%;
    }

    .header-text {
        font-size: 2em;
    }

    .notice-content {
        width: 75%;
    }
}