html,
body {
  margin: 0;
  padding: 0;
  background-color: #555;
  font-family: Haettenschweiler, sans-serif;
  color: #ccc;
  text-align: center;
  font-size: 18px;
}


button {
  margin: 0;
  border: 15px solid black;
  outline: none;
  padding: 0;
  cursor: pointer;
  color: #ccc;
  background-color: transparent;
  font-family: inherit;
  font-size: 1em;
}

#start:active {
  color: #70db70;
}
h1 {
  padding-top: 0.3em;
  border-radius: 100%;
  background-color: transparent;
  width: 100px;
  margin: 0 auto;
}


#reg {
  font-size: 0.8em;
}
#counter {
  font-size: 2em;
  margin-top: 10px;
  border-radius: 100%;
  width: 100px;
  margin: 10px auto;
}

#center {
  background-color: #000;
  border-radius: 50%;
  margin: 0 auto;
  width: 200px;
  height: 200px;
  text-align: center;
  position: relative;
  top: 100px;
  z-index: 1;
}

#green {
  border-radius: 100% 0 0 0;
  background-color: #53ac53;
  height: 200px;
  width: 200px;
  position: relative;
  top: -200px;
  left: 2px;
}


#yellow {
  border-radius: 0 0 0 100%;
  background-color: #d2d22d;
  height: 200px;
  width: 200px;
  position: relative;
  top: -200px;
}

#blue {
  background-color: #2d2dd2;
  border-radius: 0 0 100% 0;
  height: 200px;
  width: 200px;
  position: relative;
  top: -200px;
  left: -3px;
}
#red {
  border-radius: 0 100% 0 0;
  background-color: #d22d2d;
  height: 200px;
  width: 200px;
  position: relative;
  top: -200px;
  left: -2px;
}
#green:active {
  background-color: #70db70;
}

#red:active {
  background-color: #ff4d4d;
}

#yellow:active {
  background-color: #ffff4d;
}

#blue:active {
  background-color: #4d4dff;
}