Flexbox

display: flex

CSS
.container {
  display: flex;
}
Box-1
Box-2
Box-3
Box-4
Box-5
Box-6
Box-7
Box-8
Box-9

display: inline-flex

CSS
.container {
  display: inline-flex;
}
Box-1
Box-2
Box-3
Box-4
Box-5
Box-6
Box-7
Box-8
Box-9