You add the following CSS code to Tools > Custom CSS of the template style > Ja Atom:
.header-block-2 .search .inputbox {
background-image: url(data:image/svg+xml;base64,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);
background-size: 10px;
}
.header-block-2 .search .inputbox:focus {
background-image: url(data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAwAAAAMCAYAAABWdVznAAAACXBIWXMAAAsTAAALEwEAmpwYAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAADUSURBVHgBjZGBDYIwEEVbFlAnsDABbsAG4gTiBMYRmMARGEFHwAksE8gGdgLwNRZyQUn4yXHN9b/e5dAqKEmSc9/3OceMcFrre9d1ZYuUUBTMFeaCKIkNscPcAD2NMZkEFIUijuMXea0m8mbu3vIu4hU/yonObgpQq0mWKORIabj4Kx57+GYScLTdqnn5cZwErB9pzs3Ie1I9ApgvFI8/21Dj9ho5svYfzDnQlbB+nZRWnHPMLTklHwZIDySQUd+fZkKp9ibKKdAtQFarBZLQIkBA1Qe+cnC0fkpt8gAAAABJRU5ErkJggg==);
}
.head-cart #head-cart-dropdown {
background-image: url(data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAABAAAAAQCAYAAAAf8/9hAAAACXBIWXMAAAsTAAALEwEAmpwYAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAACySURBVHgB7VPBDcIwDLQRA7ABGYERYBPYhBG6QcMEjNAV2IAwAWxgzq0rpWmiNv+edEqbOzuxrRBlICInsAO/MkC/Xc67ywVj6cAfeAMv4Ad8QzvTEmBSY5PZb1RL99nEAxY92YGtnRwSr3qekRaYOYzZvdSjTXvgrV7iAsynnscYNGtiLdIEL6uxhFlv9vEPbqmj86Vo6L2G+os3qMaWYDoFh+5eaR2OFI/THkot7hr7B/o/s/LgijTlAAAAAElFTkSuQmCC);
}
