* {
  box-sizing: border-box;
}
html {
  font-size: 62.5%;
}
body {
  font-family: Helvetica, Arial, sans-serif;
  font-size: 1.6rem;
  color: #333;
  position: relative;
  margin: 0;
  padding: 0;
  display: flex;
  width: 100%;
  align-items: center;
  justify-content: center;
  height: 100vh;
}
img {
  width: 100%;
  height: auto;
}
.container {
  width: 100%;
  max-width: 800px;
  margin: 0 auto;
  border-radius: 10px;
  box-shadow: 0 4px 10px rgba(51, 51, 51, 0.2);
}
@media (max-width: 670px) {
  .container {
    width: 100%;
    height: 100vh;
  }
}
header {
  display: flex;
  justify-content: space-between;
  background: #eee;
  border-top-left-radius: 10px;
  border-top-right-radius: 10px;
  padding: 0 1rem 2rem;
  border-bottom: 5px solid #bbbbbb;
  overflow: hidden;
}
header .villain-header h2,
header .hero-header h2 {
  text-transform: uppercase;
}
@media (max-width: 670px) {
  header .villain-header h2,
  header .hero-header h2 {
    font-size: 2rem;
  }
}
.hp-bar {
  width: 300px;
  height: 30px;
  background: #333;
  border-radius: 10px;
  position: relative;
}
@media (max-width: 670px) {
  .hp-bar {
    width: 180px;
    height: 20px;
  }
}
.hp-bar .villain-hp-bar {
  content: '';
  position: absolute;
  background: #ff7878;
  height: 30px;
  width: 100%;
  top: 0;
  left: 0;
  border-radius: 10px;
  transition: width 0.2s ease-in-out;
}
@media (max-width: 670px) {
  .hp-bar .villain-hp-bar {
    height: 20px;
  }
}
.hp-bar .hero-hp-bar {
  content: '';
  position: absolute;
  background: #ff7878;
  height: 30px;
  width: 100%;
  top: 0;
  left: 0;
  border-radius: 10px;
  transition: width 0.2s ease-in-out;
}
@media (max-width: 670px) {
  .hp-bar .hero-hp-bar {
    height: 20px;
  }
}
.fighters {
  width: 100%;
  display: flex;
  justify-content: space-between;
  height: auto;
  align-items: baseline;
  padding: 0 1rem 5rem;
  background-color: #fbfbfb;
}
.fighters .villain .block,
.fighters .hero .block {
  padding: 1rem 0;
  text-align: center;
  margin-bottom: 2rem;
}
.btn {
  border: transparent;
  border-radius: 10px;
  background: #ff7878;
  color: white;
  font-size: inherit;
  padding: 1rem 2rem;
  text-transform: uppercase;
  outline: 0;
  cursor: pointer;
}
@media (max-width: 670px) {
  .btn {
    width: 100%;
    margin-bottom: 2rem;
    padding: 1.5rem 2rem;
  }
}
.messages {
  background: #e1e1e1;
  width: 100%;
  border-bottom-left-radius: 10px;
  border-bottom-right-radius: 10px;
  padding: 2rem;
  border-top: 5px solid #bbbbbb;
}
.game-over {
  position: fixed;
  width: 100%;
  height: 0;
  opacity: 0;
  top: 0;
  left: 0;
  background-color: rgba(238, 238, 238, 0.5);
  z-index: 2000;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-direction: column;
  color: white;
}
.game-over .top-span {
  font-size: 5.5rem;
  background-color: rgba(255, 120, 120, 0.5);
  border-radius: 10px;
  padding: 1rem;
  margin-bottom: 1rem;
}
.game-over .bottom-span {
  color: #333;
}
.game-over-active {
  opacity: 1;
  height: 100%;
  transition: height 200ms;
  transition: opacity 600ms;
}