contrast
0
1
2
3
4
5
<--add a filter class to body tag-->
+ <body class="filter">
<div>
<div class="v-contrast-0">
</div>
<div class="v-contrast-1">
</div>
<div class="v-contrast-2">
</div>
<div class="v-contrast-3">
</div>
<div class="v-contrast-4">
</div>
<div class="v-contrast-full">
</div>
</div>
filter-contrast version