.web-archive-search .search-form div:nth-child(1) {
    display: inline-block;
    width: 70%;
    float: left;
    margin-right: 2%;
}
.web-archive-search .search-form input[type=text] {
	width:100%;
	padding: 2px 10px;
  color: #555;
}

.web-archive-search div.input-group-btn {
    display: inline-block;
    width: 28%;
    float: right;
}