<link href="./path/to/stylesheet/style.css" rel="stylesheet" type="text/css">

<style>
body {
    background-color: linen;
}
</style>

<h2 style="text-align: center;">Centered text</h2>
 
<p style="color: blue; font-size: 18px;">Blue, 18-point text</p>

<div class="classname"></div>
<div class="class1 ... classn"></div>

.post-title {
    color: blue !important;
}

h1 { } 
#job-title { }
div.hero { }
div > p { }

color: #2a2aff;
color: green;
color: rgb(34, 12, 64, 0.6);
color: hsla(30 100% 50% / 0.6);

background-color: blue;
background-image: url("nyan-cat.gif");
background-image: url("../image.png");

.page-title {
    font-weight: bold;
    font-size: 30px;
    font-family: "Courier New";
}

.box {
    position: relative;
    top: 20px;
    left: 20px;
}

 
animation: 300ms linear 0s infinite;
 
animation: bounce 300ms linear infinite;
 

 
/* This is a single line comment */
 
/* This is a 
   multi-line comment */

div {
    display: flex;
    justify-content: center;
}
div {
    display: flex;
    justify-content: flex-start;
}

#container {
  display: grid;
  grid: repeat(2, 60px) / auto-flow 80px;
}
 
#container > div {
  background-color: #8ca0ff;
  width: 50px;
  height: 50px;
}

counter-set: subsection;
counter-increment: subsection;
counter-reset: subsection 0;
 
:root {
  --bg-color: brown;
}
element {
  background-color: var(--bg-color);
}

h1, h2 {
    color: red;
}

h3.section-heading {
    color: blue;
}

div[attribute="SomeValue"] {
    background-color: red;
}

p:first-child {
    font-weight: bold;
}

.box:empty {
  background: lime;
  height: 80px;
  width: 80px;
}

font-family: Arial, sans-serif;
font-size: 12pt;
letter-spacing: 0.02em;

 
/* Hello */
text-transform: capitalize;
 
/* HELLO */
text-transform: uppercase;
 
/* hello */
text-transform: lowercase;

@font-face {
    font-family: 'Glegoo';
    src: url('../Glegoo.woff');
}

color: red;
color: orange;
color: tan;
color: rebeccapurple;

color: #090;
color: #009900;
color: #090a;
color: #009900aa;

color: rgb(34, 12, 64, 0.6);
color: rgba(34, 12, 64, 0.6);
color: rgb(34 12 64 / 0.6);
color: rgba(34 12 64 / 0.3);
color: rgb(34.0 12 64 / 60%);
color: rgba(34.6 12 64 / 30%);

color: hsl(30, 100%, 50%, 0.6);
color: hsla(30, 100%, 50%, 0.6);
color: hsl(30 100% 50% / 0.6);
color: hsla(30 100% 50% / 0.6);
color: hsl(30.0 100% 50% / 60%);
color: hsla(30.2 100% 50% / 60%);

color: inherit;
color: initial;
color: unset;
color: transparent;
 
color: currentcolor; /* keyword */

background: url(img_man.jpg) no-repeat center;
 
background: url(img_flwr.gif) right bottom no-repeat, url(paper.gif) left top repeat;
 
background: rgb(2,0,36);
background: linear-gradient(90deg, rgba(2,0,36,1) 0%, rgba(13,232,230,1) 35%, rgba(0,212,255,1) 100%);

.column {
    max-width: 200px;
    width: 500px;
}

.block-one {
    margin: 20px;
    padding: 10px;
}

.container {
    box-sizing: border-box;
}

.invisible-elements {
    visibility: hidden;
}

div {
    margin: auto;
}

.small-block {
    overflow: scroll;
}

/* @keyframes duration | timing-function | delay |
   iteration-count | direction | fill-mode | play-state | name */
animation: 3s ease-in 1s 2 reverse both paused slidein;
 
/* @keyframes duration | timing-function | delay | name */
animation: 3s linear 1s slidein;
 
/* @keyframes duration | name */
animation: 3s slidein;
 
animation: 4s linear 0s infinite alternate move_eye;
animation: bounce 300ms linear 0s infinite normal;
animation: bounce 300ms linear infinite;
animation: bounce 300ms linear infinite alternate-reverse;
animation: bounce 300ms linear 2s infinite alternate-reverse forwards normal;

.one('webkitAnimationEnd oanimationend msAnimationEnd animationend')

.container {
  display: flex;
}

.container > div {
  flex: 1 1 auto;
}

  display: flex;
  display: inline-flex;

  flex-direction: row;            /* ltr - default */
  flex-direction: row-reverse;    /* rtl */
  flex-direction: column;         /* top-bottom */
  flex-direction: column-reverse; /* bottom-top */

  flex-wrap: nowrap; /* one-line */
  flex-wrap: wrap;   /* multi-line */

  align-items: flex-start; /* vertical-align to top */
  align-items: flex-end;   /* vertical-align to bottom */
  align-items: center;     /* vertical-align to center */
  align-items: stretch;    /* same height on all (default) */

  justify-content: flex-start;    /* [xxx        ] */
  justify-content: center;        /* [    xxx    ] */
  justify-content: flex-end;      /* [        xxx] */
  justify-content: space-between; /* [x    x    x] */
  justify-content: space-around;  /* [ x   x   x ] */
  justify-content: space-evenly;  /* [  x  x  x  ] */

  /* This: */
  flex: 1 0 auto;
 
  /* Is equivalent to this: */
  flex-grow: 1;
  flex-shrink: 0;
  flex-basis: auto;

  order: 1;

  align-self: flex-start;  /* left */
  margin-left: auto;       /* right */

.container {
  display: flex;
}
 
.container > div {
  width: 100px;
  height: 100px;
  margin: auto;
}

.container {
  display: flex;
 
  /* vertical */
  align-items: center; 
 
  /* horizontal */
  justify-content: center;
}

.container > .top {
 order: 1;
}
 
.container > .bottom {
 order: 2;
}

.container {
  display: flex;
  flex-direction: column;
}
 
.container > .top {
  flex: 0 0 100px;
}
 
.container > .content {
  flex: 1 0 auto;
}

 
.container {
  display: flex;
}
 
 
/* the 'px' values here are just suggested percentages */
.container > .checkbox { flex: 1 0 20px; }
.container > .subject  { flex: 1 0 400px; }
.container > .date     { flex: 1 0 120px; }

.container {
  align-items: center;
}

.menu > .left  { align-self: flex-start; }
.menu > .right { align-self: flex-end; }

#grid-container {
    display: grid;
    width: 100px;
    grid-template-columns: 20px 20% 60%;
}

.grid {
    display: grid;
    width: 100px;
    grid-template-columns: 1fr 60px 1fr;
}
 

/*The distance between rows is 20px*/
/*The distance between columns is 10px*/
#grid-container {
    display: grid;
    grid-gap: 20px 10px;
}

#grid-container {
    display: block;
}

.item {
    grid-row: 1 / span 2;
}

#grid-container {
    display: inline-grid;
}

.grid {
    display: grid;
    grid-template-columns: 100px minmax(100px, 500px) 100px; 
}
 

grid-row-start: 2;
grid-row-end: span 2;

grid-row-gap: length;

.item1 {
    grid-area: 2 / 1 / span 2 / span 3;
}

#container {
    display: grid;
    justify-items: center;
    grid-template-columns: 1fr;
    grid-template-rows: 1fr 1fr 1fr;
    grid-gap: 10px;
}

.item {
    grid-area: nav;
}
.grid-container {
    display: grid;
    grid-template-areas:
    'nav nav . .'
    'nav nav . .';
}

#grid-container {
    display: grid;
    justify-items: start;
}
 
.grid-items {
    justify-self: end;
}

#container {
    display: grid;
    align-items: start;
    grid-template-columns: 1fr;
    grid-template-rows: 1fr 1fr 1fr;
    grid-gap: 10px;
}

:root {
  --first-color: #16f;
  --second-color: #ff7;
}

#firstParagraph {
  background-color: var(--first-color);
  color: var(--second-color);
}

/* Set "my-counter" to 0 */
counter-set: my-counter;

/* Increment "my-counter" by 1 */
counter-increment: my-counter;

/* Decrement "my-counter" by 1 */
counter-increment: my-counter -1;

/* Reset "my-counter" to 0 */
counter-reset: my-counter;

body { counter-reset: section; }
 
h3::before {
  counter-increment: section; 
  content: "Section." counter(section);
}

ol {
  counter-reset: section;   
  list-marker-type: none;
}
 
li::before {
  counter-increment: section;
  content: counters(section, ".") " "; 
}

html {
    scroll-behavior: smooth;
}