style.css

/* || General styling */

.welcome {
  z-index: 1;
}

html, body {
  margin: 0;
}

html {
  height: 100%;
  font-size: 10px;
  font-family: sans-serif;
}

body {
  width: 70%;
  height: inherit;
  margin: 0 auto;
  min-width: 320px;
  max-width: 426px;
  min-height: 600px;
  max-height: 700px;
  position: relative;
}

section {
  width: 100%;
  height: 100%;
  position: absolute;
  background-color: black;
  color: white;
}

/* || Displaying the main image */

.game img {
  display: block;
  max-width: 98%;
  margin: 2rem auto;
}

/* || The misery progress bar */

.misery {
  width: 98%;
  margin: 0 auto;
  height: 4rem;
  background-color: white;
  margin-bottom: 2rem;
  position: relative;
}

.current-level {
  height: 100%;
  background-color: red;
}

.misery p {
  color: black;
  line-height: 1;
  font-size: 1.4rem;
  padding-right: 1rem;
  text-align: right;
  width: 200px;
  position: absolute;
  right: 0;
  top: 0;
}

/* || Buttons */

button {
  display: block;
  border: 0;
  width: 98%;
  margin: 0 auto;
  font-size: 1.4rem;
  box-shadow: inset 3px 3px 5px rgba(255, 255, 255, 0.75),
              inset -3px -3px 5px rgba(0, 0, 0, 0.25);
  background-image: linear-gradient(to bottom, rgba(0, 0, 0, 0), rgba(0, 0, 0, 0.10) 40%, rgba(0, 0, 0, 0));
  background-color: #ddd;
  cursor: pointer;
}

.button-bar {
  height: calc(100% - 395px);
}

.button-bar button {
  height: 20%;
}

.button-bar button:hover {
  background-color: #fff;
}

.button-bar button:active {
  box-shadow: inset 3px 3px 5px rgba(0, 0, 0, 0.25),
              inset -3px -3px 5px rgba(255, 255, 255, 0.75);
}

@media (max-width: 600px) {
  body {
    width: 100%;
  }
}

@media (max-width: 380px) {
  .button-bar {
    height: calc(100% - 348.6px);
  }

  body {
    min-height: 480px;
  }
}

.welcome button {
  height: 10%;
  position: absolute;
  bottom: 0.5rem;
  left: 1%;
  right: 1%;
  width: 98%;
  font-size: 2rem;
}

/* || Welcome screen styling */

.welcome h1 {
  background: url(img/emogotchi-title.png) center no-repeat;
  height: 200px;
  background-size: 100% auto;
  text-indent: -100%;
}

.welcome p {
  font-size: 1.8rem;
  line-height: 1.5;
  text-align: center;
  padding: 2rem;
}