.tenmetsu{
-webkit-animation:blink 0.5s ease-in-out infinite alternate;
-moz-animation:blink 0.5s ease-in-out infinite alternate;   
animation:blink 0.5s ease-in-out infinite alternate;    
} 
@-webkit-keyframes blink{ 
0% {opacity:0;} 
100% {opacity:1;} 
} 
@-moz-keyframes blink{ 
0% {opacity:0;} 
100% {opacity:1;} 
} 
@keyframes blink{ 
0% {opacity:0;} 
100% {opacity:1; 
}