What is HTML ?
selector {
property: value;
property: value;
property: value;
}
/* This is a comment */
*,
*::after,
*::before {
box-sizing: border-box;
}
p {
text-align: center;
color: red;
}
.paragraph {
text-align: center;
color: red;
font-size: 1.2rem;
font-family: "Courier New", Courier, monospace;
font-weight: bold;
}
p.paragraph {
text-align: center;
color: red;
}
#paragraph {
text-align: center;
}
/* descendant selector : select all <p> inside section */
section p {
color: #21211f;
}
/* child selector : select all <p> which are direct children inside section */
section > p {
color: #21211f;
}
/* Adjacent Sibling selector :
both div and p must have the same parent and it will select all <p> which
come after <div> immediately
*/
div + p {
color: #21211f;
}
/* General Sibling selector :
both div and p must have the same parent and it will select all <p> which
are sibling to <div> and come after the <div>
*/
div ~ p {
color: #21211f;
}
/* A pseudo-class is used to define a special state of an element. */
/* visited link */
a:visited {
color: #00ff00;
}
/* mouse over link */
a:hover {
color: #ff00ff;
}
/* selected link */
a:active {
color: #0000ff;
}
/* it will select the first <p> which is the first child of another element */
section p:first-child {
color: blue;
}
/* it will select the first <p> which is the first child of another element */
section p:nth-child(1) {
color: blue;
}
/* A CSS pseudo-element is used to style specified parts of an element.
For example, it can be used to:
Style the first letter, or line, of an element
Insert content before, or after, the content of an element */
h1::before {
content: url(./smiley.gif);
}
h1::after {
content: url(./smiley.gif);
}
a[target="_blank"] {
background-color: yellow;
}
/* any class "hide", or "hide-" */
[class|="hide"] {
background: yellow;
}
/* any class start with "hid" */
[class^="hid"] {
background: yellow;
}
/* any class end with "den" */
[class$="den"] {
background: yellow;
}
/* any class contain "te" */
[class*="te"] {
background: yellow;
}
input[type="text"] {
width: 150px;
display: block;
margin-bottom: 10px;
background-color: yellow;
}
section > h2 {
color: #21211f;
/*
color: hsl(60, 3%, 13%);
color: rgb(34, 34, 32);
An HSL color value is specified with: hsl(hue, saturation, lightness).
Hue is a degree on the color wheel (from 0 to 360):
0 (or 360) is red
120 is green
240 is blue
Saturation is a percentage value: 100% is the full color.
Lightness is also a percentage; 0% is dark (black) and 100% is white.
*/
}
div {
background-color: #fff;
background-image: url(../assets/html-css.png);
background-repeat: no-repeat;
background-position: top;
}
p {
border: 2px red dashed;
}
p {
margin: 2px 3px 4px 5px;
/*
margin: 10px 20px;
*/
}
<!DOCTYPE html>
<html>
<head>
<script
src="https://kit.fontawesome.com/a076d05399.js"
crossorigin="anonymous"
></script>
</head>
<body>
<div>
<i class="fas fa-car"></i>
</div>
</body>
</html>
/* unvisited link */
a:link {
color: red;
}
/* visited link */
a:visited {
color: green;
}
/* mouse over link */
a:hover {
color: hotpink;
}
/* selected link */
a:active {
color: blue;
}
ul {
list-style: none;
}
h1 {
display: none;
}
h2 {
visibility: hidden;
}
div {
width: 20%;
/*
width: 500px;
max-width: 700px;
*/
}
/* default value is static */
div {
position: relative;
}
div span {
position: absolute;
top: 30px
left: 50px;
}
/*
static : Static positioned elements are not affected by the top, bottom, left, and right properties.
fixed :is positioned relative to the viewport, which means it always stays in the same place even if the page is scrolled
relative: is positioned relative to its normal position.Setting the top, right, bottom, and left properties of a relatively-positioned element will cause it to be adjusted away from its normal position
absolute: is positioned relative to the nearest positioned ancestor (instead of positioned relative to the viewport, like fixed).
However; if an absolute positioned element has no positioned ancestors, it uses the document body
sticky: is positioned based on the user's scroll position.
*/
/*
z-index : controls which element should be placed in front of, or behind, the others
*/
img {
position: absolute;
left: 0px;
top: 0px;
z-index: -1;
}
/*
overflow controls what happens to content that is too big to fit into an area.
*/
div {
width: 200px;
height: 65px;
background-color: coral;
overflow: visible;
/*
overflow: hidden;
overflow: scroll;
overflow: auto; add scroll only when necessary
*/
}
img {
float: right;
/*
float: left;
float: none;
*/
}
/*
inline : can't set the height and the width of the element, top and bottom margin and padding are not respected
inline-block : you cab set the height, width and top and bottom margin and padding will be respected
block : add a line break after the element.
*/
span {
display: inline-block;
/*
display: block;
display: inline;
*/
}
/*
Absolute units
cm
mm
in 1in= 2.54cm
px
pt
Relative units
em : 2em means 2 times the size of the current font
rem : Relative to font-size of the root element
vw : Relative to 1% of the width of the viewport
vh : Relative to 1% of the height of the viewport
% : Relative to the parent element
*/
h1 {
font-size: 60px;
}
/*
1- Inline styles - Example: <h1 style="color: pink;">
2- IDs - Example: #navbar
3- Classes, pseudo-classes, attribute selectors - Example: .test, :hover, [href]
4- Elements and pseudo-elements - Example: h1, ::before
5- universal selector *
*/
/*
!important rule, it will override ALL previous styling rules for that specific property on that element!
*/
#my-id {
background-color: blue;
}
.my-class {
background-color: gray;
}
p {
background-color: red !important;
}