text-shadow: h-shadow v-shadow blur color;
7-1 凸版印刷效果

background: hsl(210, 13%, 40%);color: hsl(210, 13%, 75%);text-shadow: 0 -1px 1px black;
7-2 空心字

background: deeppink; color: white; text-shadow: 1px 1px black, -1px -1px black, 1px -1px black, -1px 1px black
7-3 文字外发光效果

background-color: #333; color: #ffc; text-shadow: 0 0 .1em,0 0 .3em;

.glow{ width: 100px; text-align: center; line-height: 50px; font-size: 30px; background-color: #333; color: #ffc; transition: 1s; text-shadow: 0 0 .1em,0 0 .3em; } .glow:hover{ color: transparent; text-shadow: 0 0 .1em white,0 0 .3em white; /* filter: blur(.1em); */ }
7-4 文字凸起效果

background: #58a;color: white;text-shadow: 0 1px hsl(0,0%,85%), 0 2px hsl(0,0%,80%), 0 3px hsl(0,0%,75%), 0 4px hsl(0,0%,70%), 0 5px hsl(0,0%,65%), 0 5px 10px black;

color: white;background: hsl(0,50%,45%);text-shadow: 1px 1px black, 2px 2px black, 3px 3px black, 4px 4px black, 5px 5px black, 6px 6px black, 7px 7px black, 8px 8px black