/* box-shadow: blur-radius | spread-radius */
box-shadow: 10px 5px;
/* box-shadow: offset-x | offset-y | blur-radius | spread-radius | color */
box-shadow: 5px 10px 10px 5px red;/* small, fixed */
border-radius: 5px;
/* circle */
border-radius: 50%;/* start-color, end-color */
background: linear-gradient(#e66465, #9198e5);
/* rotation, start-color, middle-color, end-color */
background: linear-gradient(45deg, blue, violet, red);
/* radial = circular */
background: radial-gradient(red 0, blue, green 100%)