HTML:
<div class="block-list">
<div class="block">
<div class="btn"></div>
<h2 class="title">Заголовок</h2>
<p>Lorem, ipsum dolor sit amet consectetur adipisicing elit. Iste, enim quisquam debitis odio cumque magni maxime totam saepe ad at quas deserunt quod, sapiente nihil cupiditate architecto odit ab officia.</p>
</div>
<div class="block">
<div class="btn"></div>
<h2 class="title">Заголовок</h2>
<p>Lorem, ipsum dolor sit amet consectetur adipisicing elit. Iste, enim quisquam debitis odio cumque magni maxime totam saepe ad at quas deserunt quod, sapiente nihil cupiditate architecto odit ab officia.</p>
</div>
<div class="block">
<div class="btn"></div>
<h2 class="title">Заголовок</h2>
<p>Lorem, ipsum dolor sit amet consectetur adipisicing elit. Iste, enim quisquam debitis odio cumque magni maxime totam saepe ad at quas deserunt quod, sapiente nihil cupiditate architecto odit ab officia.</p>
</div>
</div>
CSS:
.block-list {
display: flex;
flex-wrap: wrap;
}
.block {
background: red;
width: 200px;
height: 300px;
margin-left: 20px;
margin-bottom: 20px;
}
.title {
background: #eee;
height: 40px;
}
.btn {
width: 20px;
height: 20px;
background: green;
position: absolute;
margin-left: 160px;
margin-top: 30px;
background: url(https://i7.pngflow.com/pngimage/969/593/png-computer-icons-graphics-email-writing-icon-design-website-icon-angle-desktop-wallpaper-computer-icons-email-clipart.png) no-repeat center;
background-size: 50px;
}
.active-btn{
background:green;
}
JS(jQuery):
$('.btn').click(function(){
$(this).parent().find("p").slideToggle();
$(this).parent().find(".title").toggleClass('active-btn');
});