* {
    box-sizing: border-box;
}

body {
    font-family: 'Gill Sans', 'Gill Sans MT', Calibri, 'Trebuchet MS', sans-serif;
    font-size: 16px;
    color: #345;
    background-color: #eee;
    margin: 0;
    padding: 0;
}

.container {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
}

.content {
    padding: 2em;
    background-color: #fff;
    border-radius: 2em;
    box-shadow: 2em;
    margin: 1em;
    max-width: 95vw;
}

button {
    appearance: none;
    background-color: #36a;
    color: #fff;
    border-radius: 10px;
    border: none;
    font-size: 16px;
    padding: 0.8rem 1.2rem;
    cursor: pointer;
    vertical-align: baseline;
}

button:hover {
    background-color: #48c;
}