<div class="loading26">
  <span class="round26"></span>
  <span class="round26"></span>
  <span class="round26"></span>
  <span class="round26"></span>
</div>

.loading26{
  width: 90px;
  height: 90px;
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  align-content: space-between;
  animation: loading26-eff 3s linear infinite;
}
@keyframes loading26-eff{
  0%{
    transform: scale(1) rotate(0);
  }
  20%{
    transform: scale(1) rotate(72deg);
  }
  40%{
    transform: scale(0.5) rotate(144deg);
  }
  60%{
    transform: scale(0.5) rotate(216deg);
  }
  80%{
    transform: scale(1) rotate(288deg);
  }
  100%{
    transform: scale(1) rotate(360deg);
  }
}
.round26{
  width: 40px;
  height: 40px;
  display: block;
  border-radius: 20px 20px 20px 20px;
  box-sizing: border-box;
}
.round26:nth-of-type(1){
  background-color: #50DE68;
  animation: round-eff261 3s linear infinite;
}
.round26:nth-of-type(2){
  background-color: #3DC453;
  animation: round-eff262 3s linear infinite;
}
.round26:nth-of-type(3){
  background-color: #14BE71;
  animation: round-eff263 3s linear infinite;
}
.round26:nth-of-type(4){
  background-color: #78DE35;
  animation: round-eff264 3s linear infinite;
}
@keyframes round-eff261{
  0%{
    border-radius: 20px 20px 20px 20px 20px;
  }
  20%{
    border-radius: 20px 20px 20px 20px;
  }
  40%{
    border-radius: 20px 20px 0 20px;
  }
  60%{
    border-radius: 20px 20px 0 20px;
  }
  80%{
    border-radius: 20px 20px 20px 20px 20px;
  }
  100%{
    border-radius: 20px 20px 20px 20px 20px;
  }
}
@keyframes round-eff262{
  0%{
    border-radius: 20px 20px 20px 20px 20px;
  }
  20%{
    border-radius: 20px 20px 20px 20px;
  }
  40%{
    border-radius: 20px 20px 20px 0;
  }
  60%{
    border-radius: 20px 20px 20px 0;
  }
  80%{
    border-radius: 20px 20px 20px 20px 20px;
  }
  100%{
    border-radius: 20px 20px 20px 20px 20px;
  }
}
@keyframes round-eff263{ 
  0%{
    border-radius: 20px 20px 20px 20px 20px;
  }
  20%{
    border-radius: 20px 20px 20px 20px;
  }
  40%{
    border-radius: 20px 0 20px 20px;
  }
  60%{
    border-radius: 20px 0 20px 20px;
  }
  80%{
    border-radius: 20px 20px 20px 20px 20px;
  }
  100%{
    border-radius: 20px 20px 20px 20px 20px;
  }
}
@keyframes round-eff264{
  0%{
    border-radius: 20px 20px 20px 20px 20px;
  }
  20%{
    border-radius: 20px 20px 20px 20px;
  }
  40%{
    border-radius: 0 20px 20px 20px;
  }
  60%{
    border-radius: 0 20px 20px 20px;
  }
  80%{
    border-radius: 20px 20px 20px 20px 20px;
  }
  100%{
    border-radius: 20px 20px 20px 20px 20px;
  }
}