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HTML

CSS

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JavaScript

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HTML

              
                <h1>Width or flex-basis</h1>
<h3>Width-based items</h3>
<div class="width-based">
    <div class="width-based__item"></div>
    <div class="width-based__item"></div>
    <div class="width-based__item"></div>
    <div class="width-based__item"></div>
    <div class="width-based__item"></div>
</div>

<h3>Flexbox-based items</h3>
<div class="flexbox-based">
    <div class="flexbox-based__item"></div>
    <div class="flexbox-based__item"></div>
    <div class="flexbox-based__item"></div>
    <div class="flexbox-based__item"></div>
    <div class="flexbox-based__item"></div>
</div>
              
            
!

CSS

              
                *
    box-sizing: border-box
  
body
    background: url('https://www.toptal.com/designers/subtlepatterns/patterns/light_wool.png')
    font-family: "Avenir Next", "Avenir", "Helvetica", "Arial", sans-serif
    
h1,h3
    display: block
    text-align: center
    width: 100%
    
h1
    font-size: 60px
    margin: 40px 0
    opacity: 0.1
    
h3
    margin: 60px 0 0
    
.width-based
.flexbox-based
    background: white
    border-radius: 10px
    box-shadow: 0 4px 8px rgba(0,0,0,0.1)
    margin: 20px auto
    max-width: 800px
    padding: 15px
    width: 100%
    
.width-based
    display: block
    
    .width-based__item
        background: pink
        border-radius: 10px
        display: inline-block
        margin: 10px 9px 10px 10px /* inline-block margin wonkiness*/
        padding: 20px
        width: calc(33% - 20px)
    
.flexbox-based
    display: flex
    flex-wrap: wrap
    
    .flexbox-based__item
        background: lightgreen
        border-radius: 10px
        flex: 1 1 auto
        flex-basis: calc(33% - 20px)
        margin: 10px
        padding: 20px
              
            
!

JS

              
                
              
            
!
999px

Console