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 .container{ display: flex; width: 500px; height: 200px; } .left{ flex:1; background: red; } .middle{ flex:1; background: green; } .right{ flex:1; background: blue; } 

 .container{ display: flex; height: 300px; } .left{ flex: 0 0 100px; background-color: red; } .middle{ flex: 0 0 100px; background-color: green; } .right{ flex:1; background-color: blue; } 
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 .container{ display: flex; height: 300px; } .left{ width: 100px; background-color: red; } .middle{ flex: 1; background-color: green; } .right{ width: 100px; background-color: blue; } 
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 .container{ display: flex; height: 300px; width: 300px; flex-direction: column; } .row{ display: flex; height: 100px; } .left{ flex: 1; height: 100px; border: 1px solid red; } .middle{ flex: 1; height: 100px; border: 1px solid green; } .right{ flex: 1; height: 100px; border: 1px solid blue; } 

 *{ margin:0; padding:0; } .container{ display: flex; flex-direction: column; min-height: 100vh; justify-content: space-between; } .header{ background: red; flex: 0 0 100px; } .content{ display: flex; flex:1; } .content-left{ flex: 0 0 100px; background: green; } .content-right{ flex: 0 0 100px; background: pink; } .content-middle{ flex:1; } .footer{ background: yellow; flex: 0 0 100px; } 
Header
Left
Center
Right
Footer