Margin on child element moves parent element

Question

I have a div  parent  that contains another div  child   Parent is the first element in body with no particular CSS style  When I set   child       margin-top  10px      The end result is that top of my child is still aligned with parent  Instead of child being shifted for 10px downwards  my parent moves 10px down   My DOCTYPE is set to XHTML Transitional   What am I missing here   edit 1 My parent needs to have strictly defined dimensions because it has a background that has to be displayed under it from top to bottom  pixel perfect   So setting vertical margins on it is a no go   edit 2 This behaviour is the same on FF  IE as well as CR

User · Answer

To prevent  Div parent  use margin of  div child   In parent use these css    Float Padding Border Overflow

User · Answer

Although all of the answers fix the issue but they come with trade-offs adjustments compromises like   floats  You have to float elements  border-top  This pushes the parent at least 1px downwards which should then be adjusted with introducing -1px margin to the parent element itself  This can create problems when parent already has margin-top in relative units  padding-top  same effect as using border-top overflow  hidden  Can t be used when parent should display overflowing content  like a drop down menu overflow  auto  Introduces scrollbars for parent element that has  intentionally  overflowing content  like shadows or tool tip s triangle    The issue can be resolved by using CSS3 pseudo elements as follows     parent  before     clear  both    content        display  table    margin-top  -1px    height  0      https   jsfiddle net hLgbyax5 1

User · Answer

An alternative solution I found before I knew the correct answer was to add a transparent border to the parent element    Your box will use extra pixels though       parent       border 1px solid transparent

User · Answer

I find out that   inside of your  css  if you set the display property of a div element to inline-block it fixes the problem  and margin will work as is expected

User · Answer

the parent element has not to be empty at least put  amp nbsp  before the child element

User · Answer

I had this problem too but preferred to prevent negative margins hacks  so I put a   lt div class  supercontainer  gt  lt  div gt   around it all which has paddings instead of margins  Of course this means more divitis but it s probably the cleanest way to do get this done properly

User · Answer

Using top instead of margin-top is another possible solution  if appropriate

User · Answer

This is what worked for me   parent   padding-top  1px  margin-top  -1px      child   margin-top 260px      http   jsfiddle net 97fzwuxh

User · Answer

add style display inline-block to child element

User · Answer

Neat CSS-only solution  Use the following code to prepend a contentless first-child to the unintentionally moving div    parent before  content     position  relative height  0px width  0px overflow  hidden white-space  pre     The advantage of this method is that you do not need to change the CSS of any existing element  and therefore has minimal impact on design  Next to this  the element that is added is a pseudo-element  which is not in the DOM-tree   Support for pseudo-elements is wide-spread  Firefox 3   Safari 3   Chrome 3   Opera 10   and IE 8   This will work in any modern browser  be careful with the newer   before  which is not supported in IE8    Context  If the first child of an element has a margin-top  the parent will adjust its position as a way of collapsing redundant margins  Why  It s just like that   Given the following problem    lt style type  text css  gt  div  position  relative    parent  background-color   ccc    child  margin-top  40px    lt  style gt    lt div class  parent  gt  lt  --This div moves 40px too-- gt       lt div class  child  gt Hello world  lt  div gt   lt  div gt    You can fix it by adding a child with content  such as a simple space  But we all hate to add spaces for what is a design-only issue  Therefore  use the white-space property to fake content    lt style type  text css  gt  div  position  relative    parent  background-color   ccc    child  margin-top  40px    fix  position  relative white-space  pre height  0px width  0px overflow  hidden    lt  style gt    lt div class  parent  gt  lt  --This div won t move anymore-- gt       lt div class  fix  gt  lt  div gt       lt div class  child  gt Hello world  lt  div gt   lt  div gt    Where position  relative  ensures correct positioning of the fix  And white-space  pre  makes you not having to add any content - like a white space - to the fix  And height  0px width  0px overflow  hidden  makes sure you ll never see the fix   You might need to add line-height  0px  or max-height  0px  to ensure the height is actually zero in ancient IE browsers  I m unsure   And optionally you could add  lt  --dummy-- gt  to it in old IE browsers  if it does not work   In short  you can do all this with only CSS  which removes the need to add an actual child to the HTML DOM-tree     lt style type  text css  gt  div  position  relative    parent  background-color   ccc    child  margin-top  40px     parent before  content     position  relative height  0px width  0px overflow  hidden white-space  pre    lt  style gt    lt div class  parent  gt  lt  --This div won t move anymore-- gt       lt div class  child  gt Hello world  lt  div gt   lt  div gt

User · Answer

interestingly my favorite solution to this problem isn t yet mentioned here  using floats   html    lt div class  parent  gt       lt div class  child  gt  lt  div gt   lt  div gt    css    parent width 100px  height 100px    child float left  margin-top 20px  width 50px  height 50px     see it here  http   codepen io anon pen Iphol  note that in case you need dynamic height on the parent  it also has to float  so simply replace height 100px  by float left

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The margin of the elements contained within  child are collapsing    lt html gt   lt style type  text css  media  screen  gt       parent  background  dadada        child  background red  margin-top 17px    lt  style gt   lt body gt   lt div id  parent  gt        lt p gt  amp amp  lt  p gt        lt div id  child  gt           lt p gt  amp amp  lt  p gt           lt  div gt    lt  div gt   lt  body gt   lt  html gt    In this example  p is receiving a margin from the browser default styles  Browser default font-size is typically 16px  By having a margin-top of more than 16px on  child you start to notice it s position move

User · Answer

Found an alternative at Child elements with margins within DIVs You can also add    parent   overflow  auto      or    parent   overflow  hidden      This prevents the margins to collapse  Border and padding do the same  Hence  you can also use the following to prevent a top-margin collapse    parent       padding-top  1px      margin-top  -1px        Update by popular request  The whole point of collapsing margins is handling textual content  For example    x000D   x000D  h1  h2  p  ul   x000D    margin-top  1em  x000D    margin-bottom  1em  x000D    x000D   lt h1 gt Title  lt  h1 gt  x000D   lt div class  text  gt  x000D     lt h2 gt Title  lt  h2 gt  x000D     lt p gt Paragraph lt  p gt  x000D   lt  div gt  x000D   lt div class  text  gt  x000D     lt h2 gt Title  lt  h2 gt  x000D     lt p gt Paragraph lt  p gt  x000D     lt ul gt  x000D       lt li gt list item lt  li gt  x000D     lt  ul gt  x000D   lt  div gt  x000D   x000D   x000D    Because the browser collapses margins  the text would appear as you d expect  and the  lt div gt  wrapper tags don t influence the margins  Each element ensures it has spacing around it  but spacing won t be doubled  The margins of the  lt h2 gt  and  lt p gt  won t add up  but slide into each other  they collapse   The same happens for the  lt p gt  and  lt ul gt  element   Sadly  with modern designs this idea can bite you when you explicitly want a container  This is called a new block formatting context in CSS speak  The overflow or margin trick will give you that

User · Answer

This is normal behaviour  among browser implementations at least   Margin does not affect the child s position in relation to its parent  unless the parent has padding  in which case most browsers will then add the child s margin to the parent s padding   To get the behaviour you want  you need    child       margin-top  0      parent       padding-top  10px

[css] Margin on child element moves parent element

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