updating css demo

step1-00/css-demo/README.md

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+## CSS Demo
+
+### CSS Properties
+
+Now that we've gone over adding HTML tags to the page, lets cover adding styles to those tags. We can do quite a lot with styles! We can change:
+
+- Typography
+- Colors
+- Appearance (Corners, Borders, Decorations)
+- Layout
+- Position
+- Inline vs Block
+- Animations
+- and [many more](https://developer.mozilla.org/en-US/docs/Web/CSS/Reference)
+
+CSS is always applied in `property: value` pairs, like `background: blue;` and are terminated with a semi colon.
+
+### Applying CSS to an HTML file
+
+CSS can be applied to HTML tags in three different ways.
+
+1. Inline - Styles are applied directly to the HTML tag
+
+- `<div style="background: blue; color: white;">Hello </div>`
+
+2. Via a `<style>` tag in the HTML page
+3. Through an externally loaded CSS file
+
+- `<link rel="stylesheet" href="./css-demo-finished.css" />`
+
+### Targeting specific HTML tags
+
+Inline styles are always applied directly to the element you place them on, style tags and external CSS files need a method for matching HTML elements with their prospective style sets. We call these "selectors", and they are just as important to learn as the properties/values themselves.
+
+```css
+body {
+  font: 1.2em sans-serif;
+}
+
+/* Targeting an HTML tag */
+h1 {
+  /* Color name */
+  color: black;
+
+  /* 6 digit hex  */
+  background: #ababab;
+
+  /* Margin: property for each side */
+  margin-bottom: 15px;
+  margin-top: 15px;
+
+  /* Shorthand: Padding applies to all sides  */
+  padding: 10px;
+
+  /* 3 digit hex and border shorthand */
+  border: 1px solid #ddd;
+}
+
+/* Overriding inherited styles */
+span {
+  color: #004578;
+}
+
+/* Targeting a class name  */
+.tiles {
+  display: flex;
+}
+
+/* Decendant selector */
+.tiles img {
+  width: 100%;
+}
+
+/* Direct decendant selector */
+.tiles > div {
+  /* rgb colors */
+  background: rgb(10, 10, 10);
+  color: white;
+  flex-basis: 100%;
+  /* Longhand goes clockwise from top
+  10px - all
+  10px 20px - top/bottom left/right
+  10px 20px 15px - top left/right bottom
+  */
+  padding: 10px 20px 15px;
+  margin: 10px 20px 10px 0;
+}
+
+/* Qualified selector */
+div.links {
+  background: #004578;
+}
+
+/* Style inheritance only works for unstyled elements */
+a {
+  color: white;
+}
+
+/* Pseudo hover selector */
+a:hover {
+  color: #ccc;
+}
+
+/* Sibling selectors */
+a ~ a {
+  /* Changing elements from inline to block */
+  display: block;
+}
+
+/* Positional Pseudo Selectors  */
+.tiles > div:last-child {
+  /* overrides margin-right but leaves other margins alone */
+  margin-right: 0;
+}
+
+/* ID selector */
+#contact-form {
+  display: flex;
+  flex-direction: column;
+}
+
+/* Attribute selector */
+input[type='submit'] {
+  margin-top: 10px;
+}
+```