.mail_address {
    position: relative;
}
.email-suggest-list {
    list-style: none;
    margin: 0;
    padding: 0;
    border: 1px solid #ccc;
    background: #fff;
    position: absolute;
    z-index: 100;
    width: 100%;
    max-height: 200px;
    overflow-y: auto;
}
.email-suggest-list li {
    padding: 10px 12px;
    cursor: pointer;
    font-size: 14px;
}
.email-suggest-list li:hover,
.email-suggest-list li.active {
    background: #f0f0f0;
}