* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  display: flex;
  justify-content: center;
  align-items: center;
  min-height: 100vh;
  background-color: hsl(0, 0%, 15%);
}

.postcard {
  position: relative;
  width: 600px;
  height: 400px;
  overflow: hidden;
  border-radius: 16px;
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.5);
}

.sky {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 65%;
  /* TODO: background sky gradient */
  background: #f0c630;
  background: linear-gradient(90deg, rgba(240, 198, 48, 1) 0%, rgba(253, 29, 29, 1) 50%, rgba(252, 176, 69, 1) 100%);
}

.sun {
  position: absolute;
  top: 60px;
  right: 80px;
  width: 80px;
  height: 80px;
  /* TODO: sun shape and glow */
  border-radius: 50%;
  background-color: hsl(57, 63%, 48%);
  box-shadow: 0 0 40px 20px hsl(57, 63%, 58%);
  /* TODO: sun color experiment */
}

.hills {
  position: absolute;
  bottom: 30%;
  left: -10%;
  width: 120%;
  height: 45%;
  /* TODO: hills shape */
  background-color: green;
  border-radius: 50% 50% 0 0 / 30% 30% 0 0;

}

.water {
  position: absolute;
  bottom: 0;
  left: 0;
  width: 100%;
  height: 32%;
  /* TODO: water color and transparency */
  background: #0000ad;
  background: linear-gradient(to bottom, rgba(0, 0, 173, 0.9) 0%, rgba(0, 212, 255, 1) 100%);

}

.text-overlay {
  position: absolute;
  bottom: 40px;
  left: 0;
  width: 100%;
  text-align: center;
  font-family: Georgia, serif;
  /* TODO: text styling and shadow */
  /* TODO: text color experiment */
  font-size: 2rem;
  color:white;
  text-shadow: -7px 16px 3px rgba(0,0,0,0.6);
}