search block opacity in brine theme?

Site URL: https://plane-tunny-45nr.squarespace.com/

How do I set the opacity of the search block to be fully opaque?

The following code works perfectly:

.search-input {background-color: #50bdb8!important;}

when I do this code nothing happens

.search-input {background-color: #50bdb8!important;Opacity:1!important;}

What am I doing wrong?

Use rgba color

.search-input {
	background: rgba(80, 189, 184,0.5) !important;
}

0.5 is opacity