@import url(http://fonts.lug.ustc.edu.cn/css?family=Lato:700);
html{
  cursor:pointer;
}
body {
  font-family: 'Lato', sans-serif;
  font-size:1em;
  margin: 0;
  background:
  radial-gradient(black 15%,   
  transparent 16%) 0 0,
  radial-gradient(black 15%,   
  transparent 16%) 8px 8px,
  radial-gradient(rgba(255,255,255,.1)  
  15%, transparent 20%) 0 1px,
  radial-gradient(rgba(255,255,255,.1)  
  15%, transparent 20%) 8px 9px;
  background-color:#282828;
  background-size:16px 16px;
  overflow: hidden;
}

.block {
  width: 250px;
  color:#F7F6F2;
  text-align:center;
  padding-top:1.5em;
  height: 100px;
  position: absolute;
  background: #000;
  opacity: 0.7;
  border-radius: 2px;
  border: none;
  -moz-box-sizing: border-box;
  -webkit-box-sizing: border-box;
  box-sizing: border-box;
  box-shadow:4px 4px 4px 4px rgba(0,0,0,0.4);
  -moz-shadow:4px 4px 4px 4px  rgba(0,0,0,0.4);
  -webkit-shadow:4px 4px 4px 4px rgba(0,0,0,0.4);
    box-shadow:-4px 4px -4px 4px rgba(0,0,0,0.4);
  -moz-shadow:-4px 4px -4px 4px rgba(0,0,0,0.4);
  -webkit-shadow:-4px 4px -4px 4px rgba(0,0,0,0.4);
}
#cue{
   background:rgba(255, 255, 10, 0.5 );
   width:100px;
   height: 100px;
   position: absolute;
   border-radius: 100px;
  -webkit-transition: -webkit-transform 1s;
  -moz-transition: -moz-transform 1s;
  -ms-transition: -ms-transform 1s;
  -o-transition: -o-transform 1s;
  transition: transform 1s;
  -webkit-transform: scale( 0,0 );
  -moz-transform: scale( 0,0 );
  -ms-transform: scale( 0,0 );
  -o-transform: scale( 0,0 );
  transform: scale( 0,0 );
}
.down #cue {
    -webkit-transform: scale( 1, 1 );
       -moz-transform: scale( 1, 1 );
        -ms-transform: scale( 1, 1 );
         -o-transform: scale( 1, 1 );
            transform: scale( 1, 1 );
}