How do I make the green box (.b) tight around its contents so that I can horizontally center it?
Here is a solution that will not make the .b to be smaller in order to fit all the .c but it will make the .c to be stretched a litte in order to avoid having the white spaces.
UPDATE
I added some media queries to make sure all the elements always stay the same width. Of course this is based on exact values, so for a generic solution we may need to include calc or some variable.
* {
box-sizing: border-box;
}
.c {
background-color: blue;
margin: 5px;
height: 100px;
min-width: 80px;
flex: 1;
display: inline-block;
}
.a {
border: 1px solid red;
display: flex;
}
.b {
margin: 0 auto;
border: 1px solid green;
display: flex;
flex-wrap: wrap;
}
.b:after {
content: "";
flex: 1;
}
@media all and (max-width:1110px) {
.b:after {
margin: 5px;
}
}
@media all and (min-width:1020px) and (max-width:1110px) {
.b:after {
flex: 10;
}
}
@media all and (min-width:930px) and (max-width:1020px) {
.b:after {
flex: 7.75;
}
}
@media all and (min-width:840px) and (max-width:930px) {
.b:after {
flex: 5.5;
}
}
@media all and (min-width:750px) and (max-width:840px) {
.b:after {
flex: 3.25;
}
}
@media all and (min-width:570px) and (max-width:660px) {
.b:after {
flex: 4.33;
}
}
body {
padding: 50px;
}
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