How to adapt div's width to content with flexbox

Answer 1

UPDATE

Try this one:

 .flexrow {
  width: 90%;
  display: inline-flex;  
  flex-direction: row;
  flex-wrap: wrap;
  -webkit-align-content: center;
  align-content: center;
  -webkit-justify-content: space-between;
  justify-content: space-between;  
  margin: 0 auto;  
}
.flexrow:after {  
    content: "";  
    width: 300px;
    margin: 10px;
    padding: 10px;
    text-align: center;    
}

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Hope that what you're looking for :)