* {
  box-sizing: border-box;
}

html,
body {
  padding: 0;
  margin: 0;
  height: 100%;
}

body {
  font-family: Verdana, Geneva, Tahoma, sans-serif;
}

.container {
  position: relative;
  top: 0;
  left: 0;
  height: inherit;
}

.clearfix:before,
.clearfix:after {
    content: " ";
    display: table;
}

.clearfix:after {
    clear: both;
}


.pen {
  position: absolute;
  top: 0;
  left: 0;
  z-index: 1000;
  width: 100%;
  height: 100%;
}

.turtle {
  position: absolute;
  top: 0;
  left: 0;
  z-index: 2000;
  width: 100%;
  height: 100%;
  background-color: rgba(0,0,0,0);
}

.command {
  position: absolute;
  bottom: 0;
  width: 100%;
  height: 200px;
  border: 1px solid #ddd;
  background-color: #fff;
  padding: 10px;
  font-size: 16px;
  z-index: 10000;
  resize: none;
}

.button {
  position: absolute;
  width: 100px;
  height: 30px;
  line-height: 1;
  font-weight: bold;
  outline: none;
  cursor: pointer;
}

.button.run {
  right: 20px;
  bottom: 20px;
  z-index: 10001;
  background-color: mediumseagreen;
  border: 1px solid seagreen;
  transition: background-color 0.25s ease 0s;
}
.button.run:hover {
  background-color: seagreen;
}

.button.reset {
  right: 150px;
  bottom: 20px;
  z-index: 10002;
  background-color: lightskyblue;
  border: 1px solid dodgerblue;
  transition: background-color 0.25s ease 0s;
}
.button.reset:hover {
  background-color: dodgerblue;
}