.input-group.theme_search_field .input-group-prepend {
    z-index: 5
}

.input-group.theme_search_field .input-group-prepend button {
    border: none;
}

.input-group.theme_search_field .input-group-prepend + input {
    margin-left: 0 !important;
    border-radius: .25rem !important;
}