.container {
  display: flex;
  flex-direction: row;
  padding: 0 0 2% 0;
}

.holder {
  flex: 1;
  margin: 1%;
  border-radius: 50%;

  position: relative;

  box-shadow: 0px 0px 10px 1px black;
  transition: all .3s cubic-bezier(0.5, -1, 0.5, 2);
}

.holder:before {
  content: "";
  display: inline-block;
  padding-top: 100%;
}

.backgroundImage, .backgroundOpacity{
  position: absolute;
  border-radius: 50%;
  width: 100%;
  height: 100%;
  top: 0%;
  transition: all .3s cubic-bezier(0.5, -1, 0.5, 2);
}

.backgroundImage{
  background-size: cover;
  background-position: center;
}

.circleTabelao, .circleTabelinha, .circleLaboratorio{
  background-size: cover;
}

.circleTabelao {
  background-image: url("../images/tabelao_background.jpg");
}

.circleTabelinha {
  background-image: url("../images/tabelinha_background.jpg");
}

.circleLaboratorio {
  background-image: url("../images/laboratorio_background.jpg");
}

.backgroundOpacity{
  background-color: rgba(255,255,255,0.4);
  border: 5px solid black;
}

.holder:hover{
  transform: scale(1.1);
  box-shadow: 0px 0px 15px 4px black;
}

.holder:hover .backgroundImage{
}

.holder:hover .backgroundOpacity{
  background-color: rgba(255,255,255,0.0);
  border: 3px solid black;
}

.pegman{
  position: absolute;
  height: 27%;
  width: 100%;
  bottom: -10%;

  filter: drop-shadow(0px 0px 5px black);
}

.circleText {
  position: absolute;
  bottom: 50%;
  width: 100%;

  text-align: center;
  font-size: 48px;
  line-height: 0;
  font-family: arial, sans-serif;
  font-weight: bold;
  color: white;
  text-shadow: 2px 0 2px #000000, -2px 0 2px #000000, 0 2px 2px #000000, 0 -2px 2px #000000, 1px 1px 2px #000000, -1px -1px 2px #000000, 1px -1px 2px #000000, -1px 1px 2px #000000;
}

@media screen and (max-width: 480px) {
  body{
    background-color: red;
  }

  .container{
    flex-direction: column;
    padding: 2% 7% 0 7%;
  }

  .holder{
    margin-bottom: 15%;
  }

}

@media screen and (min-width: 481px) and (max-width: 768px) {
  body{
    background-color: blue;
  }

  .container{
    flex-direction: column;
    padding: 2% 7% 0 7%;
  }

  .holder{
    margin-bottom: 15%;
  }

}

@media screen and (min-width: 769px) and (max-width: 1024px) {
  body{
    background-color: green;
  }

  .circleText{
    font-size: 30px;
  }
}

@media screen and (min-width: 1025px) and (max-width: 1200px) {
  body{
    background-color: purple;
  }

  .circleText{
    font-size: 43px;
  }
}

@media screen and (min-width: 1201px) {
  body{
    background-color: orange;
  }
}