![]() Starts to take a different form: scss/_custom-variables.scss // Changing the theme colors $primary : #3ec89d $secondary : #3ab7ff $success : #65ff9f $info : #7164ff $warning : #ff9f65 $danger : #ff457b $light : #f2d4ff $dark : #18181d Let's add some variables to scss/_custom-variables.scss and see how our theme So we can use this file to override any of the default variables that Bootstrap uses. If you take a look at our file scss/mytheme.scss above, you see that the file scss/_custom-variables.scss Node_modules/ directory unless you want to lose your work later. This is important enough to repeat: Don't change anything in the The files under node_modules/ remain completely untouched. The colors without injecting any files into Bootstrap's source. But it's a very powerful mechanic that allows for modifying This is the opposite of what you would expect when you think about overriding something in CSS. Simply define them earlier in the Sass code. What this means is that the value will only be assigned if it has not yet been defined earlier. Notice how every last variable in this file has !default applied to it. To modify these, we'll make use of the !default rule. Open node_modules/bootstrap/ scss/_variables.scss to have a lookĪt the options that Bootstrap gives us: node_modules/bootstrap/ scss/_variables.scss // this is but a tiny snippet of _variables.scss $primary : $blue ! default $secondary : $gray-600 ! default $success : $green ! default $info : $cyan ! default $warning : $yellow ! default $danger : $red ! default $light : $gray-100 ! default $dark : $gray-800 ! default Okay, let's start off with an easy win: Modifying the existing Bootstrap variables. Our files custom-variables and custom-styles are empty, which is why our theme is essentially just standard Bootstrap 4 right now. Let's have a look at the main Sass file now, which is scss/mytheme.scss: scss/mytheme.scss 'custom-variables' './node_modules/bootstrap/scss/bootstrap' 'custom-styles' Īs you can see, this imports our two other Sass files and the Bootstrap source code which is under node_modules/bootstrap/. With the gulp watcher running in the background and our testing page loaded in the browser we can now get to theming. But this is not strictly necessary.Īs you can see, there's a collection of relevant components on the screen, organized into a layout that fits a 1920x1080 display.Īt this point they're built with the default Bootstrap 4 style, but we're about to change that. So I can then navigate to localhost:8080 instead of opening the file from the file explorer. Optional: What I usually do here is I run a simple development web server right in the project directory using Now that we have the build script running, let's have a look at our theme's current state in the browser. Finished 'watch' after 5.39 ms Step 3: Displaying the theme in the browser This is the most practical thing to do when creating a theme. ![]() You can also run gulp watch to run the Gulp watcher which will run the build each time you change one of the Sass files. Once the dependencies are installed, you can run gulp to run the build script. The packages are stored under node_modules/, so they won't pollute anything outside the project directory. ![]() This will download the Bootstrap 4 source code as well as the Sass transpiler for you. The theme kit is simply a minimal project that allows for a quick start and to play around with the theme features without too much effort.Īfter downloading and extracting the Theme Kit, you'll have to run npm install inside the directory If you've already got a web project, you would probably want to imitate these techniques with your own build system. An HTML file with Bootstrap components to allow for a quick feedback loop.A Gulp script that takes care of building, minifying and prefixing the CSS code.A Sass file structure with the correct imports already in place.It's aīasic project that includes three main parts: The Bootstrap Theme Kitĭespite its glamorous name and pompous presentation, the theme kit is a humble package. Note: Your version numbers could be slightly different, but that shouldn't be a problem. Finally you should be able to run gulp: gulp -v Once installed, you should be able to run the command npm from your command line like npm -vĪfter that, you can install a node package called Gulp, which you can do by typing npm install -g gulp-cli. To use the theme kit you'll need at least a text editor and node.js installed on your system. Long version: In order to customize Bootstrap, we will rebuild Bootstrap 4 from the source code, modifying Sass variablesĪnd making use of Bootstrap's mixins and functions. ![]()
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