HTMLify

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  overflow: hidden;
}

@font-face {
  font-family: "sans";
  src: url(font/sans.ttf);
}

body {
  background-color: #19172e;
  color: white;
  font-family: "sans";
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  height: 100vh;
}

.container {
  display: flex;
  align-items: center;
  justify-content: center;
  flex-wrap: wrap;
  width: 450px;
}

.circle {
  background-color: white;
  border-radius: 50%;
  cursor: pointer;
  margin: 8px;
  height: 14px;
  width: 14px;
  transition: transform 0.3s linear;
}

.circle.grow {
  transform: scale(2);
}

footer {
  text-align: center;
  color: white;
  font-size: 1rem;
  position: absolute;
  bottom: 0;
  margin-bottom: 0;
  padding: 5px;
  line-height: 3vh;
}

footer a:visited {
  color: inherit;
}

button {
  padding: 15px;
  font-size: 15px;
  background-color: #333333;
  color: #fff;
  border: none;
  border-radius: 8px;
  position: relative;
  transition: 0.15s ease;
  cursor: pointer;
}
button:active {
  background: rgb(30, 142, 62);
}