html - vertically centering search box in bootstrap -


backgroud:: having though problem vertically aligning search box , kind of tough nut crack , have been @ few hours , html markup clean , have @ ::

problem:: have been using display:table , display:table-cell properties search box align vertically, have @ markup : 

<header>     <img src="http://www.freestockphotos.name/wallpaper-original/wallpapers/download-images-of-gentle-dogs-6866.jpg" alt="image of laminates">              <div class="location-search-container">                 <div class="input-group custom-search-form">                     <input type="text" class="form-control">                     <span class="input-group-btn">                         <button class="btn btn-default" type="button">                                 <span class="glyphicon glyphicon-search"></span>                         </button>                      </span>                  </div><!-- /input-group -->                 </div>  </header>

note header position:relative, img display:block , location-search-container difficulty lies , positioned absolutly , has following css applied :: 

.location-search-container {     position: absolute;     top: 0;     left: 0;     width: 100%;     height: 100%;     display: table;     height: 100%; }

theoretically search box should positioned in middle , not , see result in fiddle ::

now , little tweak , lets remove image element , add following additional properties header element :: 

header {     position: relative;     /*add below 2 properties*/     height: 300px;     background: yellow; }

now see how search box centered (fiddle). relatively pretty new css , 1 though nut crack . can tell me missing ?

i know going take effort , thank time , patience.

alex-z.

you can't combine position: absolute , display: table , results you're expecting. instead, set 50% top position , negative top margin on search box equal half height:

.location-search-container {     position: absolute;     top: 0;     left: 0;     right: 0;     bottom: 0; } .input-group {     position: absolute;     top: 50%;     margin-top: -17px; }

demo


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