selector {
  property: value;
}

font-family: Arial, sans-serif;
font-size: 16px;
font-style: italic;
font-weight: bold;
line-height: 1.5;
letter-spacing: 2px;

text-align: left | center | right | justify;
text-transform: uppercase | lowercase | capitalize;
text-decoration: underline | none | line-through;
text-shadow: 1px 1px 2px gray;
white-space: nowrap | normal;
word-break: break-word;

list-style-type: disc | circle | square | none;
list-style-position: inside | outside;
list-style-image: url('bullet.png');

position: static | relative | absolute | fixed | sticky;
top, right, bottom, left: values;
z-index: 100;

background-color: #f0f0f0;
background-image: url('image.jpg');
background-size: cover | contain;
background-position: center | top right;
background-repeat: no-repeat | repeat-x | repeat-y;
background-clip: border-box | padding-box | content-box;
background-attachment: fixed | scroll;

width, height: values;
max-width, min-height: values;
padding, margin: values;
border: 2px solid #333;
border-radius: 8px;
box-sizing: border-box;
box-shadow: 2px 2px 10px rgba(0,0,0,0.2);

transition-property: none | all | color | background | transform;
transition-duration: 0.3s | 500ms;
transition-timing-function: ease | linear | ease-in | ease-out | ease-in-out | cubic-bezier(n,n,n,n);
transition-delay: 0s | 200ms;
transition: property duration timing-function delay;

animation-name: slideIn | none;
animation-duration: 1s;
animation-timing-function: ease | linear | ease-in | ease-out | ease-in-out | cubic-bezier(n,n,n,n);
animation-delay: 0s;
animation-iteration-count: 1 | infinite | number;
animation-direction: normal | alternate;
animation-fill-mode: none | forwards | backwards | both;
animation-play-state: running | paused;
 
@keyframes slideIn {
  from { transform: translateX(-100%); }
  to { transform: translateX(0); }
}
 
.element {
  animation: slideIn 1s ease-in-out 0s infinite alternate;
}

animation: name duration timing-function delay iteration-count direction;

transform: translate(x, y);      /* Move element */
transform: rotate(angle);        /* Rotate element */
transform: scale(x, y);          /* Scale element */
transform: skew(x-angle, y-angle); /* Skew element */
transform: skewX(angle);         /* Skew along X-axis */
transform: skewY(angle);         /* Skew along Y-axis */

transform: translate3d(x, y, z); /* Move element in 3D */
transform: rotateX(angle);       /* Rotate around X-axis */
transform: rotateY(angle);       /* Rotate around Y-axis */
transform: rotateZ(angle);       /* Rotate around Z-axis */
transform: scale3d(x, y, z);     /* Scale in 3D */
transform: perspective(value);   /* Perspective view */

:root {
  --main-color: #3498db;
  --padding: 10px;
}
 
.box {
  color: var(--main-color);
  padding: var(--padding);
}
 
/* Fallback value */
color: var(--secondary-color, #333);

filter: blur(5px) | brightness(1.2) | contrast(150%) | grayscale(100%) | sepia(80%) | hue-rotate(90deg);
backdrop-filter: blur(10px) | brightness(1.1) | saturate(120%);

clip-path: circle(50%);
clip-path: ellipse(60% 40%);
clip-path: inset(10px 20px 30px 40px);
clip-path: polygon(50% 0%, 0% 100%, 100% 100%);

.container {
  display: flex;
  flex-direction: row | column;
  justify-content: center | space-between | space-around | flex-start | flex-end;
  align-items: center | flex-start | flex-end | stretch;
  flex-wrap: nowrap | wrap;
  gap: 10px;
}

.grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  grid-template-rows: auto;
  gap: 10px;
  justify-items: center;
  align-items: start;
}

@media (max-width: 768px) {
  body { background-color: lightblue; }
}

cursor: auto | default | pointer | move | text | wait | not-allowed | grab | grabbing;
opacity: 0.8;
overflow: visible | hidden | auto | scroll;
object-fit: fill | contain | cover | none | scale-down;