.particles {
  background: #fafafa;
  border: 5px solid #fafafa;
  border-radius: 3px;
  height: 400px;
  margin: 10px auto;
  position: relative;
  width: 90%; }

.particle {
  background: url(../res/seahorse.svg);
  background-size: 20px 20px;
  height: 20px;
  position: absolute;
  width: 20px; }
* {
  box-sizing: border-box;
  margin: 0;
  padding: 0; }

body {
  font-family: sans-serif; }