button {
  padding: 10px 20px;
  background-color: #ff9393;
}

button:hover {
  background-color: #c51e1e;
  padding: 40px 60px;
  font-size: 50pt;
  border-radius: 100%;
}

button:active {
  background-color: #e6e6e6;
  border: solid 1px #000;
}

div {
    display: flex;
    align-items: center;
    justify-content: center;
}

.parent {
    display: flex;
}

.child {
    flex: 50%;
    padding: 20px;
}

.betterchild {
    padding: 2em;
    background-color: #ff9393;
    flex: 50%;
    padding: 40px;
}