<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Document</title>
</head>
<body>
<div class="main">
<div></div>
<div></div>
<div></div>
<div></div>
<div></div>
</div>
</body>
<style>
.main{
width:100% ;
display: flex;
justify-content: center;
flex-wrap: wrap;/* Совсем не обязательно, нужно, чтобы когда элементу не было места, он переносился */
}
.main div{
width:400px ;
height: 260px;
border-radius: 20px;
background-color: black;
margin: 0px 25px 50px 25px;
}
</style>
</html><!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Document</title>
</head>
<body>
<div style="display: flex; width: 100%; justify-content: space-evenly;" class="just">
<div>Текст</div>
<div>Текст</div>
<div>Текстолит</div>
</div>
</body>
<style>
@import url(https://fonts.googleapis.com/css?family=Montserrat:100,200,300,regular,500,600,700,800,900,100italic,200italic,300italic,italic,500italic,600italic,700italic,800italic,900italic);
.just div{
width: 300px;
height: 300px;
display: flex;
margin: 10px;
justify-content: center;
align-items: center;
background-color: black;
color: white;
font-size: 16px;
font-family: Montserrat;
transition-duration: 0.3s;
}
.just div.class1{
transition-duration: 0.3s;
box-shadow: 0px 0px 20px 30px rgba(0, 0, 0, 0.44);
}
</style>
<script>
let div = Array.from(document.querySelectorAll('.just div'))
div.forEach(function(add){
add.addEventListener('mouseover', function(){
add.classList.add('class1')
})
add.addEventListener('mouseout', function(){
add.classList.remove('class1')
})
})
</script>
</html>