html - ul widht auto stretch with maximum height -


i have html structure this:

<ul class="groupmenu-drop">   <li class="level1">       <a href="#"> bmw </a>      <ul class="level1 groupmenu-drop">         <li class="level2"> i3 </li>         <li class="level2"> i5 </li>         <li class="level2"> i7 </li>        </ul>   </li>   <li class="level1">       <a href="#"> mercedez benz </a>      <ul class="level1 groupmenu-drop">         <li class="level2"> a-class </li>         <li class="level2"> e-class </li>         <li class="level2"> c-class </li>         <li class="level2"> s-class </li>          </ul>   </li>  </ul>

my current css:

ul.groupmenu-drop{     display: block;     text-align: left;     padding: 0;     margin: 0;     position: absolute;     background: #fff;     top: 100%;     z-index: 99;      list-style: none none;     box-sizing: border-box; }  li{     list-style: none     padding: 8px 15px;     min-width: 230px;     position: relative;     margin: 0px auto;     box-sizing: border-box; }  .groupmenu-drop > li {     width: 100%; }

i want make first ul have maximum height when level1 li , child overlapping ul height make ul stretch width , level1 li fill it, here's want like:

sketch

try this, using flex-flow: column wrap; display li columns, , wrap if necessary or there space available vertically. 

.groupmenu-drop:not(.level1) {    max-height: 200px;    display: -webkit-flex;    display: flex;    -webkit-flex-flow: column wrap;    flex-flow: column wrap;  }
<ul class="groupmenu-drop">    <li class="level1">      <a href="#"> bmw </a>      <ul class="level1 groupmenu-drop">        <li class="level2"> i3 </li>        <li class="level2"> i5 </li>        <li class="level2"> i7 </li>      </ul>    </li>    <li class="level1">      <a href="#"> mercedez benz </a>      <ul class="level1 groupmenu-drop">        <li class="level2"> a-class </li>        <li class="level2"> e-class </li>        <li class="level2"> c-class </li>        <li class="level2"> s-class </li>      </ul>    </li>    <li class="level1">      <a href="#"> audi </a>      <ul class="level1 groupmenu-drop">        <li class="level2"> a-class </li>        <li class="level2"> e-class </li>        <li class="level2"> c-class </li>        <li class="level2"> s-class </li>      </ul>    </li>  </ul>


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