How to make a PNG float ontop of other images [closed] - html

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What css code should i use to make this transparent png element with a shadow in the png file, float over the upper image to avoid this white stripe?
http://postimg.org/image/ektu4srvn/
http://postimg.org/image/dged2yme3/

Use z-index CSS property to control which elements 'float' over others. An element with a z-index of 1 would appear above an element with z-index 0 when the two overlap.
W3Schools Z-Index
As Andy Furniss points out in the comments, in order for z-index to work, position property should be set on the element.
W3Schools Position

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Why does buy button not move down when I apply CSS style of margin-top onto its class?

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I am a new to HTML and CSS.enter image description here
The blue buy button is a paragraph element in the html code. The "From $1999" is known as the class "fourth" in the html code.
Why does the blue buy pseudo-button not move down when I apply margin-top onto the class "button" in style? It only moves down when I apply margin-bottom on the class "fourth". I supposed if I applied margin-top onto the blue buy pseudo-button, it would move the button down, which was the same case if I applied margin-bottom onto the class "fourth". Eager for explanation. Thank you!
Margins take up space. If you want a similar effect without that, try outline

Why Does Flex Direction Column Disable Top , Bottom? [closed]

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I'm trying to adjust the paragraph spacing and move it closer to the title, but Top or Bottom seems to be disabled when using flex-direction: column... What can I do to push up .par2?
Properties bottom and top work with position: absolute; elements. They don't work with other positions.
You have to use padding-top or margin-top with negative meaning (for example -10px).
And you can check properties margin and padding by headers ('CATORING', 'EVENT HOSTING', 'DELIVERY') using GoogleChrome Devtools. Most likely it is they who prevent the text from being located higher.

Why won't my div background color change? [closed]

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enter image description here
enter image description here
When I change the background color of the entire page it's working but when I change the specific div container background color it's not working
The reason the backgtround color doesn't change is because you don't have any content in your <div>. If you add some html to your <div>, you will see the background color that you set in your css.

background-color of div does not appear in the image [closed]

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I have used a p tag inside a div tag:
div{background-color:#3B3B3B;}
p{float:left;}
The background-color of div does not appear in the image:
How to solve this?
Using float on a child will cause the parent to collapse. There are many alternative solutions, see How do you keep parents of floated elements from collapsing?

Bootstrap Column - Position Relative and Z Index [closed]

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I have an element that has a fixed position to the bottom left corner of the browser window. I noticed that the text in footer layers above the fixed position element.
I traced this back to the Bootstrap style for columns that sets them to a relative position. If I remove or override that style, the layering appears as I desire. I don't, however, know why that style is there. I am concerned over unintended side-effects.
Why does Bootstrap use position: relative in their column class?
I'm also open to other ways of accomplishing my desired layering without changing core Bootstrap styles.
EDIT
When creating a minimal example, I found that the issue was not present. I then looked to my own CSS for the problem. I found that it was z-index: 0 on the element containing the fixed position element that was the culprit. Changing it to z-index: 1 fixed the problem.
Add a class to the element that you want to change then overwrite the Bootstrap styles with the new class.
It is difficult to guess without a code example, but something like:
<footer><p class="override-bootstrap">Some text</p></footer>
CSS
.override-bootstrap {
// here reset the styles
}
Make sure that the stylesheet for your new class is included after the bootstrap css.