.buildersearch-form {
    position: relative;
}

.buildersearch-form .search-field {
    width: 100%;
}

.buildersearch-form .search-submit {
    width: 43px;
    border: 1px solid #000;
    background: black;
    color: white;
    padding: 0;
    position: absolute;
    right: 0;
    top: 0;
    bottom: 0;
    font-size: 1em;
    letter-spacing: normal;
    cursor: pointer;
}