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HTML

              
                <div class="container">
  <div class="sky">
    <div class="sun"></div>
    <div class="stars"></div>
  </div>
  <div class="ocean"></div>
  <div class="sun-reflection"></div>
</div>
              
            
!

CSS

              
                /* Container */
.container {
  width: 600px;
  height: 400px;
  border: 5px solid lightgray;
  position: relative;
  display: flex;
  justify-content: center;
  align-items: center;
}

/* Ocean */
.ocean {
  position: absolute;
  width: inherit;
  height: 178px;
  left: 0px;
  top: 222px;
  background: conic-gradient(
    from 90deg at 50% 125%,
    #021e34,
    #055ca7,
    #052b4c,
    #003b90,
    #00174a
  );
}

/* Sky */
.sky {
  position: absolute;
  width: inherit;
  height: 222px;
  top: 0;
  left: 0;
  background-image: linear-gradient(
    0deg,
    hsl(205deg 55% 42%) 0%,
    hsl(207deg 58% 40%) 4%,
    hsl(210deg 63% 37%) 9%,
    hsl(213deg 69% 35%) 15%,
    hsl(216deg 80% 32%) 21%,
    hsl(215deg 98% 27%) 28%,
    hsl(215deg 96% 25%) 35%,
    hsl(214deg 94% 23%) 42%,
    hsl(212deg 91% 20%) 49%,
    hsl(208deg 88% 16%) 56%,
    hsl(210deg 89% 16%) 63%,
    hsl(213deg 91% 15%) 70%,
    hsl(216deg 93% 15%) 76%,
    hsl(220deg 96% 15%) 82%,
    hsl(220deg 98% 14%) 87%,
    hsl(218deg 97% 13%) 91%,
    hsl(215deg 95% 13%) 95%,
    hsl(211deg 94% 12%) 98%,
    hsl(206deg 93% 11%) 100%
  );
}

/* Stars */
.stars {
  position: absolute;
  width: inherit;
  height: 150px;
  top: 0;
  left: 0;
}

.stars::before {
  content: "";
  position: absolute;
  width: inherit;
  height: 160px;
  top: 0;
  left: 0;
  background: radial-gradient(#fff 5%, transparent 5%);
  background-position: top left, 5px 23px;
  background-size: 15px 15px;
  border-radius: 50%;
  opacity: 0.1;
  transform: skew(20deg);
}

.stars::after {
  content: "";
  position: absolute;
  width: inherit;
  height: 130px;
  top: -30px;
  left: 10px;
  background: radial-gradient(#fff2d6 5%, transparent 5%);
  background-position: top left, 15px 15px;
  background-size: 20px 20px;
  border-radius: 50%;
  opacity: 0.1;
  transform: skew(35deg);
}

/* Sun */
.sun {
  position: absolute;
  width: 30px;
  height: 30px;
  top: 206px;
  left: 280px;
  background: radial-gradient(
    circle,
    #fff2d6 20%,
    #d89766 25%,
    transparent 55%
  );
}

/* Sun reflection */
.sun-reflection {
  position: absolute;
  width: 357px;
  height: 178px;
  top: 222px;
  left: 116px;
  background: conic-gradient(
    from 168deg at top,
    #d89766 0deg 20deg,
    #0000 21deg
  );
  -webkit-mask: linear-gradient(#0000, #000);
  mask-image: linear-gradient(#0000, #000);
}

/* Body */
body {
  margin: 0;
  padding: 0;
  height: 100vh;
  display: flex;
  justify-content: center;
  align-items: center;
  flex-wrap: wrap;
}

              
            
!

JS

              
                
              
            
!
999px

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