body {
    position: relative;
    z-index: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    float: left;
    width: 100%;
    height: auto;
    min-height: 100vh;
    margin: 0;
    padding: 0;
}

body main {
    position: relative;
    z-index: 1;
    display: inline-block;
    float: left;
    width: 600px;
    max-width: 100%;
    height: auto;
    margin: 0;
    padding: 0 15px;
}

body main p.info {
    margin-bottom: 0;
}

p.error {
    display: none;
    color: red;
}

@media screen and (max-width: 768px) {

    body main a,
    body main button[type="submit"] {
        width: 100%;
    }

}