html - Adding transition effect to my css -


i have following

html

<div id="left_nav_wrapper">     <div class="sidebar_wrapper">       <div class="sidebar_header">header</div>       <div class="sidebar_content">content</div>    </div>    <div class="sidebar_wrapper">        <div class="sidebar_header">header</div>        <div class="sidebar_content">content</div>    </div>  </div>

css 

.sidebar_wrapper { width: 150px;  } .sidebar_header { width: 150px; background-color: #f18986;  } .sidebar_content { display: none; width: 150px; margin-left: -150px; background-color: #444; } .sidebar_header:hover + .sidebar_content { display: inherit; margin-left: 0px; }

i want when hover on header, content shows (which have done) want add transition slides in, when 

add transition: 1s; -webkit-transition: 1s;

to css not anything, have added .sidebar_header , .sidebar_content , can not figure out why not use transition when appearing.

any appreciated thanks!

transitions not work on display property. have set properties height: 0 100px have done here. 

.sidebar_content {     height: 0;     width: 150px;     margin-left: -150px;     background-color: #444;     -moz-transition: height 0.5s ease-in;     -o-transition: height 0.5s ease-in;     -webkit-transition: height 0.5s ease-in;     transition: height 0.5s ease-in; }  .sidebar_header:hover + .sidebar_content {     height: 100px;     margin-left: 0px; }

you cannot transition height auto. in case don't want fix height of sidebar_content

you have transition on max-height property setting high value never reaches. have consequences. have adjust transition duration remove delay when max-height transitions 0 high value.

as maximum value of max-height increases reverse transition delayed


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