How do I horizontally center an absolute positioned element inside a 100 width div

Question

In the example below   logo is positioned absolutely and I need it to be horizontally centered within  header  Normally  I would do a margin 0 auto for relatively positioned elements but I am stuck here  Can someone show me the way   JS Fiddle  http   jsfiddle net DeTJH   HTML   lt div id  header  gt       lt div id  logo  gt  lt  div gt   lt  div gt    CSS   header       background black      height 50px      width 100       logo       background red      height 50px      position absolute      width 50px

User · Answer

Its easy  just wrap it in a relative box like so    lt div class  relative  gt    lt div class  absolute  gt LOGO lt  div gt   lt  div gt    The relative box has a margin  0 Auto  and  important  a width

User · Answer

In my experience  the best way is right 0   left 0  and margin 0 auto  This way if the div is wide then you aren t hindered by the left  50   that will offset your div which results in adding negative margins etc   DEMO http   jsfiddle net kevinPHPkevin DeTJH 4    logo       background red      height 50px      position absolute      width 50px      margin 0 auto      right 0      left 0

User · Answer

If you want to align center on left attribute  The same thing is for top alignment  you could use margin-top   width 2 of your div   the concept is the same of left attribute  It s important to set header element to position relative  try this    logo       background red      height 50px      position absolute      width 50px      left 50       margin-left -25px      DEMO  If you would like to not use calculations you can do this    logo     background red    width 50px    height 50px    position absolute    left  0    right  0    margin  0 auto      DEMO2

User · Answer

Was missing the use of calc in the answers  which is a cleaner solution    logo     position  absolute    left  calc 50  - 25px     height  50px    width  50px    background  red        Works in most modern browsers  http   caniuse com calc  Maybe it s too soon to use it without a fallback  but I thought maybe for future visitors it would be helpful

User · Answer

here is the best practiced method to center a div as position absolute  DEMO FIDDLE  code --   header   background black  height 90px  width 100   position relative     you forgot this  this is very important     logo   background red  height 50px  position absolute  width 50px  margin  auto     margin auto works just you need to put top left bottom right as 0 top 0  bottom 0  left 0  right 0

User · Answer

You will have to assign both left and right property 0 value for margin  auto to center the logo   So in this case    logo     background red    height 50px    position absolute    width 50px    left  0    right  0    margin  0 auto      You might also want to set position  relative for  header   This works because  setting left and right to zero will horizontally stretch the absolutely positioned element  Now magic happens when margin is set to auto  margin takes up all the extra space equally on each side  leaving the content to its specified width  This results in content becoming center aligned

[html] How do I horizontally center an absolute positioned element inside a 100% width div?

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