CSS is a style sheet language. Lets you selectively style HTML elements
For example: color all <p> elements red:
p { color: red; }


Universal: * matches everything
Element: input will match any <input> element
Class: .classname will match any element that has class="classname"
ID: #blah will match the element that has id=blah
Attribute: [autoplay] will match all elements that have the autoplay attribute set (to any value)
Grouping: div, span will match both <div> and <span> elements
Descendent: div span will match all <span> elements that are inside a <div>
Child: ul > li will match all <li> elements that are nested directly inside a <ul> element
Sibling: p ~ span will match all <span> elements that follow a <p>, immediately or not
Adjacent Sibling: h2 + p will match the first <p> element that immediately follows an <h2>
Column: col || td will match all <td> elements that belong to the scope of the <col>
Pseudo classes: a:visited will match <a> elements that have been visited by the user
Pseudo elements: p::first-line will match the first line of all <p> elements

Box Model

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Designed to offer space distribution between items in an interface and powerful alignment capabilities.
To create a flex container: display: flex or display: inline-flex - then all its children will be flex items
It’s 1-dimensional in so far as it deals with layout in one dimension at a time. First the main axis, then the cross axis.
Main axis - flex-direction
  • row or row-reverse
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  • column or column-reverse
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Cross Axis is the perpendicular axis to the chosen main axis.
Start and End lines - based on writing modes - if your on English, then start is left. if you’re working in Arabic, then start is on the right and end is on the left.
Wrapping: flex-wrap
flex-direction: row and flex-wrap: wrap can be combined into flex-flow: row wrap, etc.
Filling available space:
flex-basis: auto, flex-basis: 200px - set initial main size of a flex item.
flex-grow: 1, flex-grow: 3 - grow factor of a flex item. specifies how much of the remaining space in the flex container should be assigned to the item. If all sibling items have the same flex grow factor, then all items will receive the same share of remaining space, otherwise it is distributed according to the ratio defined by the different flex grow factors.
flex-shrink: 0, flex-shrink: 1 - shrink factor. If the size of all flex items is larger than the flex container, items shrink to fit according to flex-shrink These 3 can be combined into shorthand flex: 1 1 auto (grow, shrink, basis)
Predefined shorthand values that cover most cases:
  • flex: initial - same as flex: 0 1 auto
  • flex: auto - same as flex: 1 1 auto
  • flex: none - same as flex: 0 0 auto
  • flex: <positive-number> - flex: 2 is the same as flex: 2 1 0
  • align-items: stretch - stretch to height of container
  • align-items: flex-start - line up at the start (top left in english)
  • align-items: flex-end - line up at the end (bottom right in english)
  • align-items: center - if direction is row, then it vertically aligns it in the center. if it’s row it’s horizontal center.

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