Give it a try…. When I remove the negative margin, it works perfectly fine. Also, in another project, the code does not work regardless of whether I put in the negative margin or not, Which leaves me even more confused.
When you put negative margins, the element who has them will overlap next element. PS: Overlapping will occur if element with negative margin has higher z-index. If it have lower, it will go underneath. Thus, negative margins are actually allowed to pull elements closer to their neighbours without being hindered by regular margin collapsing.
Negative margin-left and -right work the same, provided the element has a width. Here we apply margin-left: px and margin-right: 10px. As you see, the first paragraph is now offset 10px to the left, while retaining its width. Thus, its right edge also moves 10px to the left.
The second paragraph with the negative margin-right is unaffected. Here is the reference element. This is exactly the same effect as with a negative margin-bottom. Also note that the second paragraph has a negative margin-top, which means it is offset 10px upward.
The third paragraph has a negative margin-bottom, which has no effect, since it does not have a bottom neighbour. Remember: margin collapsing does not work on margin-left and -right; just on -top and -bottom. Therefore we do not have to worry about it in this case. If we give the second paragraph a margin-left: px, the same happens. Just like with top and bottom, left and right are interchangeable for this effect. They do not have a fixed width any more; instead they fill up their parent element completely while respecting its padding.
The paragraph with margin-left: px is still offset 10px to the left, but its width grows. Thus, its right edge is not offset but stays where it is. Third paragraph with margin-left: px; margin-right: px. The negative margin-right now does the same thing. This only happens when an element has width: auto. As we saw before, elements with a fixed width behave quite differently.
Finally, the third paragraph has both. This is by far the most common use case for negative margins. You give a container a padding so that its contents have some breathing space.
However, you want the header to span the entire container, ignoring the padding. Collapsing margins happen when two vertical margins come in contact with one another. If one margin is greater than the other, then that margin overrides the other, leaving one margin. YuriKolovsky, a much simpler way of fixing margin collapsing is to add a border to the top of the element 1px sold transparent would probably work, if not the color of the background , I find that works every time and if the 1px is a problem, just add a 1px negative top margin!
Things Which Prevent Margin Collapsing Margins never collapse if an item has absolute positioning, or is floated. In the example below I have added 1px of padding to the box. Using a padding or border will prevent collapse only in the latter case. Also, any value of overflow different from its default visible applied to the parent will prevent collapse. Thus, both overflow: auto and overflow: hidden will have the same effect.
When you float elements, the parent container no longer honors the space of the floated elements inside it, so its height collapses. Consequently, it causes the margin-right property not to have any visual effect. The margin property defines the space around an HTML element. It is possible to use negative values to overlap content. The margin-bottom specifies the bottom margin of an element.
The margin-top specifies the top margin of an element. The margin-left specifies the left margin of an element. The margin-bottom CSS property sets the margin area on the bottom of an element. A positive value places it farther from its neighbors, while a negative value places it closer.
The CSS margin properties are used to create space around elements, outside of any defined borders. With CSS, you have full control over the margins. There are properties for setting the margin for each side of an element top, right, bottom, and left. This deposit is known as the minimum margin. With that in mind: Margin exposes you to a higher risk of bigger losses. It also allows you to earn more from the gains.
0コメント