diff --git a/snippets/calc.md b/snippets/calc.md
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----
-title: Calc()
-tags: other
----
-
-The function calc() allows to define CSS values with the use of mathematical expressions, the value adopted for the property is the result of a mathematical expression.
-
-```html
-<div class="box-example"></div>
-```
-
-```css
-.box-example {
-  height: 280px;
-  background: #222 url('https://image.ibb.co/fUL9nS/wolf.png') no-repeat;
-  background-position: calc(100% - 20px) calc(100% - 20px);
-}
-```
-
-#### Explanation
-
-1. It allows addition, subtraction, multiplication and division.
-2. Can use different units (pixel and percent together, for example) for each value in your expression.
-3. It is permitted to nest calc() functions.
-4. It can be used in any property that `<length>`, `<frequency>`, `<angle>`, `<time>`, `<number>`, `<color>`, or `<integer>` is allowed, like width, height, font-size, top, left, etc.
-
-#### Browser support
-
-- https://caniuse.com/#feat=calc
diff --git a/snippets/custom-variables.md b/snippets/custom-variables.md
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----
-title: Custom variables
-tags: other
----
-
-CSS variables that contain specific values to be reused throughout a document.
-
-```html
-<p class="custom-variables">CSS is awesome!</p>
-```
-
-```css
-:root {
-  /* Place variables within here to use the variables globally. */
-}
-
-.custom-variables {
-  --some-color: #da7800;
-  --some-keyword: italic;
-  --some-size: 1.25em;
-  --some-complex-value: 1px 1px 2px whitesmoke, 0 0 1em slategray, 0 0 0.2em slategray;
-  color: var(--some-color);
-  font-size: var(--some-size);
-  font-style: var(--some-keyword);
-  text-shadow: var(--some-complex-value);
-}
-```
-
-#### Explanation
-
-- The variables are defined globally within the `:root` CSS pseudo-class which matches the root element of a tree representing the document. Variables can also be scoped to a selector if defined within the block.
-- Declare a variable with `--variable-name:`.
-- Reuse variables throughout the document using the `var(--variable-name)` function.
-
-#### Browser support
-
-- https://caniuse.com/#feat=css-variables