body {
  margin: 0;
}

#balloon-container {
  height: 100vh;
  padding: 1em;
  box-sizing: border-box;
  display: flex;
  flex-wrap: wrap;
  overflow: hidden;
}

.balloon {
  height: 125px;
  width: 105px;
  border-radius: 75% 75% 70% 70%;
  position: relative;
}

.balloon:before {
  content: "";
  height: 75px;
  width: 1px;
  padding: 1px;
  background-color: #FDFD96;
  display: block;
  position: absolute;
  top: 125px;
  left: 0;
  right: 0;
  margin: auto;
}

.balloon:after {
    content: "▲";
    text-align: center;
    display: block;
    position: absolute;
    color: inherit;
    top: 120px;
    left: 0;
    right: 0;
    margin: auto;
}

@keyframes float {
  from {transform: translateY(100vh);
  opacity: 1;}
  to {transform: translateY(-300vh);
  opacity: 0;}
}