style.css

* {
  box-sizing: border-box;
}
body{
  display:grid;
  place-items: center;
}
.main {
  display: inline-block;
  /* take up width of children */
  position: relative;
  margin: 0;
  padding: 0;
}
.ui {
  position: absolute;
  display: flex;
  /* height: 30px; */
  width: 100%;
  align-items: center;
  text-align: center;
  padding: 2px;
}
.pl1 {
  background: yellow;
  width: 100%;
  height: 30px;
  position: relative;
  border: 4px solid white;
  /* padding: 1em; */
}
.timer {
  background: black;
  width: 100px;
  height: 50px;
  padding: 1em;
  flex-shrink: 0;
  display: flex;
  justify-content: center;
  /* hor */
  align-items: center;
  /* vert */
  font-size: 32px;
  color: beige;
}
.pl2 {
  position: relative;
  background: yellow;
  width: 100%;
  height: 30px;
  border: 4px solid white;
  /* padding: 1em; */
}
#enemyhealth {
  background: rgb(97, 97, 228);
  /* height: 30px; */
  /* width: 100%; */
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  position: absolute;
}
#playerhealth {
  background: rgb(180, 46, 46);
  /* height: 30px;
  width: 100%; */
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  position: absolute;
}

#winner {
  position: absolute;
  color: rgb(24, 22, 22);
  display: flex;
  justify-content: center;
  /* hor */
  align-items: center;
  /* vert */
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  font-size: 50px;
  text-transform: uppercase;
}