html, body {
  margin: 0;
  padding: 0;
  background-color: black;
  color: white;
  font-family: "Signika Negative", sans-serif;
  text-align: center;
}

h1 {
  margin: 20px;
  text-align: center;
}

svg {
  overflow: visible;
  height: 100%;
  max-width: 100%;
}

circle {
  fill: white;
}

path {
  stroke-width: 3px;
  stroke: #444;
  fill: none;
}

.nav {
  display: flex;
  justify-content: center;
  padding: 0 0 20px 0;
  align-content: center;
}

button {
  position: relative;
  margin: 5px 10px 5px 0px;
  outline: none;
  border: none;
  padding: 10px 16px;
  background: #414141;
  background-image: -webkit-linear-gradient(top, #575757, #414141);
  background-image: -moz-linear-gradient(top, #575757, #414141);
  background-image: linear-gradient(to bottom, #575757, #414141);
  text-shadow: 0px 1px 0px #414141;
  -webkit-box-shadow: 0px 1px 0px 414141;
  -moz-box-shadow: 0px 1px 0px 414141;
  box-shadow: 0px 1px 0px 414141;
  color: #ffffff;
  text-decoration: none;
  border-radius: 4px;
  font-family: "Signika Negative", sans-serif;
  text-transform: uppercase;
  font-weight: 600;
  cursor: pointer;
  font-size: 18px;
  line-height: 18px;
}

button:hover {
  background: #57a818;
  background-image: -webkit-linear-gradient(top, #57a818, #4d9916);
  background-image: -moz-linear-gradient(top, #57a818, #4d9916);
  background-image: -ms-linear-gradient(top, #57a818, #4d9916);
  background-image: -o-linear-gradient(top, #57a818, #4d9916);
  background-image: linear-gradient(to bottom, #57a818, #4d9916);
  color: #ffffff;
  text-decoration: none;
}