@media (max-width: 575.98px) {
  .container-about {
    margin-top: -200px;
    margin-bottom: 100px;
  }
  .so {
    margin-top: -80px;
  }
  .sertif .column img {
    border-radius: 5px;
    width: 150px;
    height: 250px;
  }
}

.container-about h3 {
  margin-top: 100px;
}
/* Clear floats after image containers */
.row::after {
  content: "";
  clear: both;
  display: table;
}

#organisasi {
  background-image: url(../img/about/bg-about.png);
  background-position: center;
  background-repeat: no-repeat;
  background-size: contain;
  width: auto;
  height: auto;
  margin-top: -75px;
  text-align: center;
  position: relative;
}
#organisasi .container-about {
  z-index: 1;
  position: relative;
}
#organisasi::after {
  content: "";
  display: block;
  width: 100%;
  height: 100%;
  background-image: linear-gradient(to top, rgba(0, 0, 0, 1), rgba(0, 0, 0, 0));
  position: absolute;
  bottom: 0;
}

#sertifikat {
  background-image: url(../img/gallery/8.JPG);
  background-size: cover;
  background-position: center;
  background-repeat: no-repeat;
  width: auto;
  height: auto;
  margin-top: -75px;
  text-align: center;
  position: relative;
}
#sertifikat .container-about {
  z-index: 1;
  position: relative;
}
#sertifikat::after {
  content: "";
  display: block;
  width: 100%;
  height: 100%;
  background-image: linear-gradient(
    to bottom,
    rgba(0, 0, 0, 1),
    rgba(0, 0, 0, 0)
  );
  position: absolute;
  bottom: 0;
}

.column {
  float: left;
  padding: 5px;
  margin: 5px;
}

.column img {
  border-radius: 5px;
  width: 200px;
  height: 300px;
}