Hi paulus1032,
I have helped you add the following CSS code to the Custom CSS:
.search {
align-items: center;
align-content: center;
display: flex;
}
.search .form-search {
position: relative;
}
.search .form-search:before {
background-image: url(data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAwAAAAMCAYAAABWdVznAAAACXBIWXMAAAsTAAALEwEAmpwYAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAADUSURBVHgBjZGBDYIwEEVbFlAnsDABbsAG4gTiBMYRmMARGEFHwAksE8gGdgLwNRZyQUn4yXHN9b/e5dAqKEmSc9/3OceMcFrre9d1ZYuUUBTMFeaCKIkNscPcAD2NMZkEFIUijuMXea0m8mbu3vIu4hU/yonObgpQq0mWKORIabj4Kx57+GYScLTdqnn5cZwErB9pzs3Ie1I9ApgvFI8/21Dj9ho5svYfzDnQlbB+nZRWnHPMLTklHwZIDySQUd+fZkKp9ibKKdAtQFarBZLQIkBA1Qe+cnC0fkpt8gAAAABJRU5ErkJggg==);
background-size: 12px;
background-repeat: no-repeat;
position: absolute;
content: "";
z-index: 4;
top: 12px;
left: -18px;
width: 20px;
height: 20px;
}
