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

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

.center {
    width: 100%;
    height: 100%;
    display: inline-flex;
    justify-content: center;
    align-items: center;
}

.message {
    animation: fade-in 3s;
    -webkit-animation: fade-in 3s;
    -moz-animation: fade-in 3s;
    -o-animation: fade-in 3s;
}

h1 {
    margin-bottom: 10%;
}

h1, h2 {
    font-family: "Open Sans", sans-serif;
    text-align: center;
}

hr {
    border: 1px solid black;
    margin-top: 10px;
    margin-bottom: 10px;
}

@keyframes fade-in {
    0% {
        opacity: 0;
    }
    100% {
        opacity: 1;
    }
}