* {
  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%;
  background: #020024;
background: linear-gradient(180deg, rgba(2, 0, 36, 1) 0%, rgba(9, 9, 121, 1) 35%, rgba(0, 212, 255, 1) 100%);
}

.sun {
  position: absolute;
  top: 60px;
  right: 80px;
  width: 80px;
  height: 80px;
  border-radius: 116px 116px 154px 116px;
-webkit-border-radius: 116px 116px 154px 116px;
-moz-border-radius: 116px 116px 154px 116px;
background: #ec3e09;
box-shadow: 22px 23px 5px 1px rgba(230,130,29,0.75);
-webkit-box-shadow: 22px 23px 5px 1px rgba(230,130,29,0.75);
-moz-box-shadow: 22px 23px 5px 1px rgba(230,130,29,0.75);
}

.hills {
  position: absolute;
  bottom: 30%;
  left: -10%;
  width: 120%;
  height: 45%;
  background: radial-gradient
   (ellipse 120% 60% at 50% 100%,
  hsl(120, 54%, 36%),
  hsl(120, 40%, 25%));
border-radius: 50% 50% 0 0 / 30% 30% 0 0;
}

.water {
  position: absolute;
  bottom: 0;
  left: 0;
  width: 100%;
  height: 32%;
  
  background: linear-gradient(
  to bottom,
  hsla(210, 70%, 50%, 0.85),
  hsla(210, 60%, 30%, 1)
);
}

.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 */
}