body {
  font-family: Verdana;
}

h1 {
  color: red;
}

p {
  border: 10px dotted blue;
  padding: 20px;
  box-shadow: 0 0 50px green;
  transition: box-shadow 1s;
}

p:hover {
  box-shadow: 0 0 20px yellow;
}

img {
  transition: transform 3s;
}

img:hover {
  transform: rotate(360deg);
}

.exploison {
  background: yellow;
  border-radius: 100%;
  animation: boom 2s ease-in-out;
  position: absolute;
}

@keyframes boom {
  from {
    width: 0px;
    height: 0px;
    margin-left: 0;
    margin-top: 0;
  }
  to {
    width: 200px;
    height: 200px;
    margin-left: -100px;
    margin-top: -100px;
  }
}