#welcome {
    float: left; 
    width: 310px; 
    margin-right: 1em; 
    border-right: 1px solid #ccc;
    border-bottom: 1px solid #ccc;
    padding-bottom: 1em;
    background:#fff;
}
#welcome * {
    padding-right: 1em;
}
#openhouse {
    border: 1px solid #000;
    padding: .5em;
    margin-left: 320px;
    text-align: center;
    font-weight: 700;
}