app/assets/stylesheets/adminpanel/_search-input.scss.erb
input[type="text"].search-input {
width: 85%;
border-radius: 15px;
margin-top: 10px;
margin-left: 7.5%;
margin-right: 7.5%;
padding-left: 30px;
background: url(<%= asset_path('adminpanel/magnifier.png') %>) no-repeat 8px 6px;
background-size: 15px 15px;
background-color: white;
}