article, aside, figure, footer, header, nav, section {
    display: block;
}
body {
   
    background-color: white;
    margin: 0 auto;
    width: 650px;
    border: 3px solid gray;
}
section {
    padding: 0 2em 1em;
}

.join{
    text-align: center;
}

label {
    float: left;
    width: 11em;
    text-align: right;
}
input {
    margin-left: 1em;
    margin-bottom: .5em;
}
span {
    color: red;
}