*{
  margin: 0;
  padding: 0;
}

#simon_body, #simon_center, #simon_control_holder{
  position: fixed;
  background-color: black;
  top: 50%;
  left: 50%;
}

#simon_body{
  width: 400px;
  height: 400px;
  margin-top: -200px; /* Negative half of   height. */
  margin-left: -200px; /* Negative half     of width. */
  border-radius: 2000px;
}

#simon_center{
  z-index: 1;
  width: 200px;
  height: 200px;
  margin-top: -100px; /* Negative half of   height. */
  margin-left: -100px; /* Negative half     of width. */
  border-radius: 2000px;
}

#green, #red, #yellow, #blue{
  display: inline-block;
  height: 160px;
  width: 160px;
  opacity: 0.7;
}

#green{
  background-color: green;
  border-top-left-radius: 200px;
  margin-top: 30px;
  margin-left: 30px;
}

#red{
  background-color: red;
  border-top-right-radius: 200px;
  margin-left: 15px;
}
#yellow{
  background-color: yellow;
  margin-top: 15px;
  margin-left: 30px;
  border-bottom-left-radius: 200px;
}
#blue{
  background-color: blue;
  border-bottom-right-radius: 200px;
  margin-left: 15px;
}

#simon_control_holder{
  z-index: 1;
  width: 150px;
  height: 150px;
  margin-top: -75px; /* Negative half of   height. */
  margin-left: -75px; /* Negative half     of width. */
  border-radius: 2000px;
  background-color: white;
  display: inline-block;
}

#game_label{
  font-size: 30px;
  width: 100px;
  font-family: sans-serif;
  font-weight: bold;
  margin-left: 30px;
  margin-top: 20px;
  margin-bottom: 10px;
  display: inline-block;
}

#button_holder{
  margin: 0 0 0 0;
  height: 45px;
  display: inline-block;
}

#counter{
  background-color: grey;
  height:35px;
  width: 35px;
  border-radius: 5px;
  margin-left: 15px;
  display: inline-block;
}

#round{
  width: 30px;
  text-align: center;
  font-size: 25px;
  display: inline-block;
  margin-top: 4px;
  margin-left: 2px;
  color: red;
}

#start_button{
  height: 25px;
  width: 25px;
  background-color: red;
  border-radius: 15px;
  display: inline-block;
  vertical-align: middle;
  margin-bottom: 10px;
  margin-left: 7px;
}

#strict_button{
  height: 25px;
  width: 25px;
  background-color: yellow;
  border-radius: 15px;
  display: inline-block;
  vertical-align: middle;
  margin-bottom: 10px;
  margin-left: 7px;
}

#count_label{
  margin-left: 15px;
}
#start_label{
  margin-left: 3px;
}
#strict_label{
  margin-left: 3px;
}

.label{
  display: inline-block;
  font-family: sans-serif;
  font-size: 15px;
}

#start_button, #strict_button, #simon_body, .choice{
    -moz-box-shadow:    1px 1px 1px 2px rgba(0, 0, 0, 0.8), inset 0 0 10px rgba(0, 0, 0, 0.8);
  -webkit-box-shadow: 1px 1px 1px 2px rgba(0, 0, 0, 0.8), inset 0 0 10px rgba(0, 0, 0, 0.8);
  box-shadow:         1px 1px 1px 2px rgba(0, 0, 0, 0.8), inset 0 0 10px rgba(0, 0, 0, 0.8);
}

#start_button:active{
  background-color:#550000;
}