If you have a container with flex height & display flex, then follow this if you want the children to be laid in the column.
Make changes in settings:
-webkit-flex-flow: column wrap;
And for this Chrome automatically add space between div and border top. If we do not want to add space automatically, then we can use:
margin-bottom:100%;
This will move the item up
.flex-container {
position: fixed;
height: 80%;//this will change height of flex container to 80%
padding: 1;
margin: 1; // this will change margin to 1
list-style: none;
border: 7px solid red; // this will change border to solid red
display: -webkit-box;
display: -moz-box;
display: -ms-flexbox;
display: -webkit-flex;
display: flex;
-webkit-flex-flow: column wrap;
justify-content: flex-start
align-content: flex-start;
align-items: flex-start
}
/** Just to show the elements */
body {
margin: 0;
padding: 0;
}
.flex-item {
background: tomato;
padding: 5px;
width: 100px;
height: 100px;
margin-bottom: 100%;
line-height: 150px;
color: white;
font-weight: bold;
font-size: 3em;
text-align: center;
}
<ul class="flex-container">
<li class="flex-item">1</li>
<li class="flex-item">2</li>
<li class="flex-item">3</li>
<li class="flex-item">4</li>
<li class="flex-item">5</li>
<li class="flex-item">6</li>
</ul>