css: how to center box div element directly in center?

top and left correspond to the top-left corner of your box. What you’re trying to do is have them correspond to the center. So if you set margin-top and margin-left to negative of one-half the height and width respectively, you’ll get a centered box. Example for a 300×200 box:

How do you Hover in ReactJS? – onMouseLeave not registered during fast hover over

How can you achieve either a hover event or active event in ReactJS when you do inline styling? I’ve found that the onMouseEnter, onMouseLeave approach is buggy, so hoping there is another way to do it. Specifically, if you mouse over a component very quickly, only the onMouseEnter event is registered. The onMouseLeave never fires, … Read more

CSS display: inline vs inline-block

Inline elements: respect left & right margins and padding, but not top & bottom cannot have a width and height set allow other elements to sit to their left and right. see very important side notes on this here. Block elements: respect all of those force a line break after the block element acquires full-width if width not defined … Read more

@Media min-width & max-width

I’ve found the best method is to write your default CSS for the older browsers, as older browsers (including IE 5.5, 6, 7 and 8) can’t read @media. When I use @media, I use it like this: But you can do whatever you like with your @media. This is just an example of what I’ve found best for … Read more

how to offset a CSS border up and left

We have a WordPress sidebar designed like this: Note the grey border of the large white div is offset up and left (ignore the same effect on the image inside the white div please) – we want the border offset in our final design. I’ve tried building this with HTML: and CSS: However, on the live page the … Read more