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

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

body {
    display: flex;
    justify-content: center;
    align-items: center;
    background: #ffffff;
}

.container {
    text-align: center;
}

h1 {
    font-size: 10rem;
    font-weight: bold;
    color: #333333;
    margin: 0;
    font-family: Arial, sans-serif;
    opacity: 1;
    transition: opacity 0.5s ease-in-out;
}

h1.fade-out {
    opacity: 0;
}

h1.fade-in {
    opacity: 1;
}