.errv {
    width: 100%;
    padding: 0;
    font-family: 'arial', sans-serif;
    font-size: 12px;
    font-weight: normal;
    color: red;
    text-align: center;
}
.okv {
    width: 100%;
    padding: 0;
    font-family: 'arial', sans-serif;
    font-size: 12px;
    font-weight: normal;
    color: green;
    text-align: center;
}

.hlist {
    margin: 0 2em;
}

.big_btn, .big_btn:link, .big_btn:visited, .big_btn:hover {
    text-decoration: none;
    font-weight: bold;
    font-size: larger;
    line-height: 1em;
    background-color: yellow;
    border-radius: 4px;
    border: 1px solid black;
    color: black;
    padding: 1.25em 1.5em;
    margin: 0.5em;
}

.big_btn:hover {
    cursor: pointer;
    background-color: lightyellow;
}

.add_qs_d {
    margin: 1em 0;
}