body {
display: flex;
flex-wrap: wrap;
justify-content: center; /* 1 */
align-content: space-between; /* 2 */
height: 100vh;
margin: 0;
}
div {
flex: 0 0 90%; /* 3 */
height: 100px;
border: 2px dashed red;
}
.side, .stuff {
flex-basis: 25%; /* 4 */
margin: 5px;
}
<div class="header">header</div>
<div class="side">stuff</div>
<div class="stuff">side</div>
<div class="footer">footer</div>
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