How to customize the active fields of an Elementor form

CSS 

selector input:focus{
background-color: #D8D4D4!important;
color:blue!important;
}
selector select:focus{
background-color: #D8D4D4!important;
color:blue!important;
}
selector textarea:focus{
background-color: #D8D4D4!important;
color:blue!important;
}

If for this tutorial you need a plugin you can find it in the plugin page.