/* Base styles */
html, body {
    height: 100%;
    margin: 0;
}

/* Animation */
.blink {
    animation-name: animation_blink;
    animation-timing-function: ease-in;
    animation-duration: 2s; 
    animation-iteration-count: infinite;            
}

@keyframes animation_blink {
    0% { opacity: 1; }
    25% { opacity: 0.8; }
    50% { opacity: 0.2; }
    75% { opacity: 0.8; }
    100% { opacity: 1; }    
}