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HTML

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CSS

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CSS Base

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JavaScript

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JavaScript preprocessors can help make authoring JavaScript easier and more convenient.

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Babel includes JSX processing.

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HTML 

              
                <div class="section">
	<div class="circle-cont">
		<div class="circle-w"></div>
		<div class="circle">
			<span>⏰</span>
		</div>
	</div>
<div/>
!

CSS 

              
                /* imposta dimensioni sezione */
.section {
	/* imposta larghezza al massimo */
 width: 100%;
	/* imposta altezza al 100% della schermata*/
 height: 100vh;
}

/* imposta sezione e contenitore dei cerchi 
   come colonna FLEX e centra i contenuti */
.section, .circle-cont, .circle {
	/* imposta elemento FLEX */
 display: flex;
	/* imposta la direzione del FLEX come colonna */
 flex-direction:column;
	/* allinea contenuti su asse orizzontale */
 align-items: center;
	/* allinea contenuti su asse verticale */
 justify-content: center;
}


/* imposta dimensioni contenitore */
.circle-cont {
 width: 100%;
 height: 100%;
}

/* imposta il cerchio grigio */
.circle {
	/* imposta la dimensione dell'emoji */
 font-size: 100px;
	/* imposta il colore di sfondo */
 background-color: #dfdfdf;
	/* imposta le dimensioni */
 width: 220px;
 height: 220px;
	/* imposta il raggio del bordo per creare un cerchio */
 border-radius: 50%;
	/* imposta l'ombra nera con opacità del 30% */
 box-shadow: 0px 0px 20px 2px rgba(0,0,0,0.3);
	/* imposta "l'elevazione" del cerchio rispetto 
	   agli altri elementi con z-index inferiore*/
 z-index:110;
}
 
/* imposta il cerchio animato */
.circle-w {
	/* imposta le dimensioni del cerchio animato
	   in proporzione all'altezza schermo 
	   -60% del visibile- */
 width: 60vh;
 height: 60vh;
	/* imposta il valore di scala ad 1 -100%- */
 transform: scale(1, 1);
	/* imposta il raggio del bordo per creare un cerchio */
 border-radius: 50%;
	/* imposta il bordo con 1px grigio */
 border: 1px solid #333333;
	/* imposta tempi e easing delle transizioni
	   per questo elemento */
 transition: all 300ms ease-in-out;
	/* imposta l'animazione -blink- con durata di 3sec
	   e ripetizione infinita */
 animation: blink 3s infinite;
	/* imposta il colore di sfondo */
 background-color: rgba(0, 0, 0, .3);
  /* imposta "l'elevazione" del cerchio rispetto 
	   agli altri elementi con z-index inferiore o 
	   superiore */
 z-index:100;
  /* imposta il posizionamento */	
 position: absolute;
}
 
/* imposta i frames per l'animazione */
@keyframes blink {
	/* imposta l'inizio scala 0% e opacità 100%*/
 0% {transform: scale(0, 0); opacity:1;}
	/* imposta la fine scala 100% e opacità 0%*/
 100% {transform: scale(1, 1); opacity: 0;}
}
!

JS
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999px

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