Styled components claim to cover all of css but I've run into this simple but significant issue. I need to enlarge my line-height but in a relative way, otherwise the line gets cut (it's height is smalled than the letters).
When I try to use rem or % as unit, I get an error saying a number type is expected instead of a string.
line-height: 100% means 100% of the font size for that element, not 100% of its height. In fact, the line height is always relative to the font size, not the height, unless its value uses a unit of absolute length (px, pt, etc). another option which you can try is using table-cell
#wrapper{
height: 40px;
width:200px;
display: table-cell;
vertical-align: middle;
text-align: center;
background: red;
}
Related
With preprocessor variables it's easy to set up one variable and manipulate it so that I can use it to set multiple properties. (demo)
While experimenting with native css variables, I noticed that I could combine them with preprocessor variables, so in the following example: (use firefox)
h1 {
--length: 40px;
#length: var(--length);
line-height: #length;
border: 5px solid tomato;
}
line-height was correctly rendered at 40px
But, when I tried to manipulate the preprocessor variable - like this:
h1 {
--length: 40px;
#length: var(--length);
#length2: #length*2;
line-height: #length;
padding: #length2;
border: 5px solid tomato;
}
... the code failed.
Is this possible somehow?
As mentioned in my comment, my understanding of CSS variables is that the variable is resolved into its actual value by the UA. This happens after the Less compiler compiles the file and thus it wouldn't be aware of what is the actual value contained by the CSS variable.
To the compiler, the value of #length is only var(--length). Since this is not a number, an error is thrown during compilation indicating that the math operation is being done on an invalid type.
OperationError: Operation on an invalid type on line 4, column 3:
One way to fix this would be to make the Less compiler output the variable name as it is and have the multiplier appended to it (like string concatenation). This would then leave the control to the UA.
But since all CSS math operations have to be given within calc() function, the entire thing has to be wrapped within it. So, the below code would work fine.
h1 {
--length: 40px;
#length: var(--length);
#length2: ~"calc(#{length} * 2)";
line-height: #length;
padding: #length2;
border: 5px solid tomato;
}
Or, even the below would be enough if --strict-math is enabled during compilation:
h1 {
--length: 40px;
#length: var(--length);
#length2: calc(#length * 2);
line-height: #length;
padding: #length2;
border: 5px solid tomato;
}
Above code when compiled produces an output similar to the one in Example 11 of the specs and so it should be a reasonably good way of doing this :)
... Note, though, that calc() can be used to validly achieve the same thing, like so:
.foo {
--gap: 20;
margin-top: calc(var(--gap) * 1px);
}
var() functions are substituted at computed-value time...
I am new to bootstrap, and I added bootstrap 3 into my project and it shrunk all the font sizes, I never had any font size specified in these classes. I thought bootstrap 3 had the default size to 14.. is there something else I need to do?
Thanks
It appears to be happening, at least as of version 3.3.6, due to this block on line 1097:
html {
font-size: 10px;
-webkit-tap-highlight-color: rgba(0, 0, 0, 0);
}
You can restore your font-size by adding this to your stylesheet:
html
{
font-size: 100%;
}
You can customize/override anything - if, for example, you load YOUR css file AFTER the bootstrap file, then your settings will override it. Whatever you can dream:
p {
font-size 18px;
}
and so on...
I strongly recommend digging into the source code: https://github.com/twbs/bootstrap/blob/master/dist/css/bootstrap.css
html {
font-size: 62.5%;
-webkit-tap-highlight-color: rgba(0, 0, 0, 0);
}
body {
font-family: "Helvetica Neue", Helvetica, Arial, sans-serif;
font-size: 14px;
line-height: 1.428571429;
color: #333333;
background-color: #ffffff;
}
UPDATE: TO clarify, "No" you shouldn't have to do anything else. It sounds like there is another problem. The linked source code has changed since the original answer date... as of Feb 2015, it looks like this:
html {
font-size: 10px;
}
body {
font-size: 14px;
}
Assuming we've set our project up correctly, (bower install bootstrap is pretty easy)... attempting to echo text outside of the body should result in 10px text, inside body should be 14px.
If you don't see 14 point text inside the body, then something else might be stepping on it. I'd next inspect in in Chrome (for example) to confirm where the font-size was coming from.
I'd like to add that I think it's helpful to understand how these values we see in this /dist/css file are derived from less variables... the defaults should work out of the box, but you have easy control over everything, including the body text size: see http://getbootstrap.com/css/#less-variables.
I am changing the height of a SlickGrid header and rotating the text in the header with the following CSS:
.slick-column-name {
-webkit-transform: rotate(-90deg);
-moz-transform: rotate(-90deg);
-ms-transform: rotate(-90deg);
-o-transform: rotate(-90deg);
transform: rotate(-90deg);
-webkit-transform-origin: 50% 50%;
-moz-transform-origin: 50% 50%;
-ms-transform-origin: 50% 50%;
-o-transform-origin: 50% 50%;
transform-origin: 50% 50%;
}
.slick-header-columns, .slick-header-column {
height: 200px !important;
}
For a better understanding, please take a look at this:
http://jsfiddle.net/2Nvc3/1/
The rotated text in the header is centered and cut off. How can I change the alignment, so that it starts on the bottom (the text should be left-aligned before the -90° rotation)?
The width of one of the columns is different on purpose.
Link to jsFiddle I played around for a while. Basically the problem was that the origin of rotation was the middle of your text/header. Since "Else else SOmeshing Else" is significantly longer than the other column names, it sticks out on both sides. Either way - changing the origin of location to the beginning of the text solves this issue. Then to center um...horizontally(after the rotation) the text we put a margin-left of 40% - at leat that looks good in Chrome, not exactly sure why it's not 50%. To center the text um...vertically(after the rotation) we just add a text-indent of -235px, which is dictated by the height chosen here to fit the text, which is 250px.
How should I go about optimizing CSS code? There's various CSS3 lines, like -moz- and -webkit-, border-top-left-radius, etc.. I believe bigger CSS files increase page load time significantly.
And another question: I've written quite some code, however some of it is left unused. I have over 2000 lines of CSS code, and I bet around 200-300 lines could be removed, perhaps even more. Is it worth revising all the code? It would take quite some time...
GZip the files before uploading them on server
It will reduce the files size significantly
Edit: Effect of GZipping -
By gzipping the .css file on Bargaineering, its size dropped from 28.2K to 7.3K, a 74.1% savings.
always remove the last semicolon:
body { background: black; color: white; }
to
body { background: black; color: white }
combine multiple properties:
.class { margin-top: 10px; margin-right : 20px; margin-bottom: 30px; margin-left: 40px; }
to
.class { margin: 10px 20px 30px 40px; }
use simple colors (instead of `#FFFFFF, #AABBCC, #FF0000 put #FFF, #ABC, #F00)
the most important thing: minify your code before uploading on the server. It will remove whitespaces and comments and significantly reduce your code and file size.
The smaller the file, the quicker it will download and the faster users can render the styles. There are various minifying scripts, I'd check out the YUI Compressor: http://refresh-sf.com/yui/
Dear folks.
Imagine a sprite image called icons.png assigned to css class .icons with various 10x10px graphs. Now you want another class which scales up the sprite graphics exactly twice 200% (making them 20x20 pixels on the screen)
How do I achieve this enlargement purely in CSS?
Much appreciated!
.icons, .iconsbig{ /* WORKS FINE */
background-image:url(http://site.org/icons.png);
background-repeat:no-repeat;
vertical-align: middle;
display: block;
height:10px;
}
.iconsbig{ /* make this one twice as big as the original sprite */
background-repeat:no-repeat;
height:20px;
background-size: 20px auto;
image-rendering:-moz-crisp-edges;
-ms-interpolation-mode:nearest-neighbor;
}
update:
problems with the above code:
It works in IE9, but not in FireFox, by most used browser doesnt know how to resize????
in IE9, the enlargement is smudgy and not neithrest neighbour pixel perfect at all??
It is supported in pretty much everything except for < IE9...
.iconsbig {
-moz-background-size: 20px;
background-size: 20px;
image-rendering:-moz-crisp-edges;
-ms-interpolation-mode:nearest-neighbor;
}
W3C spec.
Update
Looks like Firefox wants its vendor prefix (-moz) on the property.
You can use the css3 background-size property:
.iconsbig {
background-image:url(http://site.org/icons.png);
background-size: 20px 20px;
}