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

body {
  font-size: 16px;
  font-family: "Roboto", sans-serif;
}

.main-grid {
  display: grid;
  width: 100%;
  height: 100vh;
  align-content: center; /*eje Y*/
  justify-content: center; /*eje X*/
  background: url("bg-image-girl.png") no-repeat center center fixed;
  -webkit-background-size: cover;
  -moz-background-size: cover;
  -o-background-size: cover;
  background-size: cover;
  grid-template-areas:
  "unique-cell"
  ;
}

.section-item {
  width: 90%;
  background-color: #fff;
  border: 2px solid orange;
  align-self: center;
  justify-self: center;
  padding: 10px;
  grid-area: unique-cell;
  height: 90vh;
  z-index: 2;
  border-radius: 10px;
  -webkit-box-shadow: 0px 14px 5px -10px rgba(0,0,0,0.36);
  box-shadow: 0px 14px 5px -10px rgba(0,0,0,0.36);
  opacity: 0.9;
}

.section-item h1 {
  padding-bottom: 10px;
}

.div-animated-bg{
  grid-area: unique-cell;
  width: 100%;
  height:100vh;
}

.ul-circles {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  overflow: hidden;
}

.ul-circles li{
  position: absolute;
  display: block;
  list-style: none;
  width: 20px;
  height: 20px;
  background: rgba(159, 252, 6, 1);
  animation: animate 25s linear infinite;
  bottom: -150px;
}

.ul-circles li:nth-child(1){
  left: 25%;
  width: 80px;
  height: 80px;
  animation-delay: 0s;
  background: orange;
}

.ul-circles li:nth-child(2){
  left: 10%;
  width: 20px;
  height: 20px;
  animation-delay: 2s;
  animation-duration: 12s;
  background: yellow;
}

.ul-circles li:nth-child(3){
  left: 70%;
  width: 20px;
  height: 20px;
  animation-delay: 4s;
  background: orange;
}

.ul-circles li:nth-child(4){
  left: 40%;
  width: 60px;
  height: 60px;
  animation-delay: 0s;
  animation-duration: 18s;
  background: #00c6fb;
}

.ul-circles li:nth-child(5){
  left: 65%;
  width: 20px;
  height: 20px;
  animation-delay: 0s;
  background: #005bea;
}

.ul-circles li:nth-child(6){
  left: 75%;
  width: 110px;
  height: 110px;
  animation-delay: 3s;
  background: black;
}

.ul-circles li:nth-child(7){
  left: 35%;
  width: 150px;
  height: 150px;
  animation-delay: 7s;
}

.ul-circles li:nth-child(8){
  left: 50%;
  width: 25px;
  height: 25px;
  animation-delay: 15s;
  animation-duration: 45s;
  background: #E65C00;
}

.ul-circles li:nth-child(9){
  left: 20%;
  width: 15px;
  height: 15px;
  animation-delay: 2s;
  animation-duration: 35s;
  background: white;
}

.ul-circles li:nth-child(10){
  left: 85%;
  width: 150px;
  height: 150px;
  animation-delay: 0s;
  animation-duration: 11s;
  background: yellow;
}

@keyframes keyframe-bg-circles {
  0%{
    transform: translateY(0) rotate(0deg);
    opacity: 1;
    border-radius: 0;
  }

  100%{
    transform: translateY(-1000px) rotate(720deg);
    opacity: 0.5;
    border-radius: 100%;
  }
}