Change Css Element That Comes After Another

I would like to hover in a.bio change the background .pic to green. I tried some ways, but it did not work out. I did not understand the logic of ~ and how even to make it work.

Solution 1:

Move your a.bio in your HTML, because ~ is a sibling selector (however less strict than the +), and use position to stay as it was before moving the HTML:

Snippet

.executivo.pic::after {
  background-color: #00845b;
  content: "";
  height: 100%;
  left: 0;
  position: absolute;
  top: 0;
  width: 100%;
  opacity: 0;
  transition: .3s ease-in-out;
}
.executivo {
  position: relative;
}
.executivoa.bio {
  position: absolute;
  bottom: -20px
}
.executivoa.bio:hover ~ .picimg {
  opacity: 0.35;
}
.executivo.pic {
  margin-bottom: 45px;
  position: relative;
}
.executivo.picimg {
  display: block;
  max-width:100%/*demo*/
}

<divclass="executivo"><aclass="bio"href="#">Bio+</a><divclass="pic"><imgsrc="//lorempixel.com/1600/900"alt="alt text" /></div><divclass="title"><h3>title</h3></div></div>

Solution 2:

Nex element selector is

+

And direct decedent is

>

in css.

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