:root{
  --main-time: 8s;
  --half-time: 4s;
  --offset1: 0s;
  --offset2: -0.5s;
  --offset3: -1s;
  --offset4: -1.5s;
  --offset5: -2s;
  --offset6: -2.5s;
  --offset7: -3s;
  --offset8: -3.5s;
  --margin-left: 100px;
  --ball-path-length: 400px;
  --tube-width: 200px;
  --height: 1400px;
  --tube-height: 1400px;
  --border: 1px groove black;
  --background: linear-gradient(
    355deg,
    hsl(240deg 100% 20%) 0%,
    hsl(289deg 100% 21%) 11%,
    hsl(315deg 100% 27%) 22%,
    hsl(329deg 100% 36%) 33%,
    hsl(337deg 100% 43%) 44%,
    hsl(357deg 91% 59%) 56%,
    hsl(17deg 100% 59%) 67%,
    hsl(34deg 100% 53%) 78%,
    hsl(45deg 100% 50%) 89%,
    hsl(55deg 100% 50%) 100%
  );
  --tube-color: linear-gradient(
    270deg,
    #ffa857 0%,
    #ffea00 100%
  );
  --ball-color: linear-gradient(
    330deg,
    #4d0000 0%,
    #b21515 100%
  );
}

body{
  height: 100vh;
  padding-left: 100px;
  position: relative;
  padding-bottom: 50px;
  padding-top: 190px;
  background-image: var(--background);
  filter: grayscale(1);
  font-family: 'Calibri', sans-serif;
}
.text{
  position: absolute;
  transform: translateX(600px) translateY(-40px);
  width: 800px;
  height: 1300px;
  padding: 50px;
  background-image: var(--tube-color);
  color: var(--ball-color);
}
h1{
  font-size: 100px;
  margin-top: 0;
  margin-bottom: 0;
}
p{
  font-size: 30px;
}

.ball {
  position: relative;
  width: 80px;
  height: 80px;
  margin: -40px;
  border: var(--border);
  border-radius: 50%;
  background-image: var(--ball-color);
  animation: ball-rotation-animation var(--half-time) infinite ease-in-out;
}
.tube-top{
  position: absolute;
  width: var(--tube-width);
  height: var(--tube-width);
  margin-left: var(--margin-left);
  border-radius: 50%;
  z-index: 99;
  border: var(--border);
  transform: translateY(-100px);
  background-image: var(--tube-color);
}
.tube-bottom{
  position: absolute;
  width: var(--tube-width);
  height: var(--tube-width);
  margin-left: var(--margin-left);
  border-radius: 50%;
  z-index: 99;
  border: var(--border);
  transform: translateY(1300px);
  background-image: var(--tube-color);
}

.tube{
  position: absolute;
  width: var(--tube-width);
  height: var(--tube-height);
  z-index: 100;
  margin-left: var(--margin-left);
  border-left: var(--border);
  border-right: var(--border);
  background-image: var(--tube-color);
}

.ball1 {animation-delay: var(--offset1);}
.ball2 {animation-delay: var(--offset2);}
.ball3 {animation-delay: var(--offset3);}
.ball4 {animation-delay: var(--offset4);}
.ball5 {animation-delay: var(--offset5);}
.ball6 {animation-delay: var(--offset6);}
.ball7 {animation-delay: var(--offset7);}
.ball8 {animation-delay: var(--offset8);}

@keyframes ball-rotation-animation {
  0%{
    z-index: 101;
    transform: translateX(0);
  }
  25%{
    z-index: 150;
  }
  50%{
    z-index: 101;
    transform: translateX(var(--ball-path-length)) ;
  }
  51%{
    z-index: 99;
  }
  75%{
    z-index: 50;
  }
  100%{
    z-index: 90;
    transform: translateX(0);
  }
}