main.css

head
ul.a {
    list-style-type: circle;
}

.sections{
  color:#777;
  background-color:rgb(205, 242, 249,0.5);
  text-align:center;
  padding:50px 80px;
  text-align: justify;
}

body {
  font-family: 'Open Sans', sans-serif;
  color: black;
}
.thumbnail {
  position: relative;
  width: 25px;
  height: 25px;
  overflow: hidden;
}
.thumbnail img {
  position: absolute;
  left: 25%;
  top: 25%;
  height: auto;
  width: auto;
  -webkit-transform: translate(-25%,-25%);
      -ms-transform: translate(-25%,-25%);
          transform: translate(-25%,-25%);
}
.thumbnail img.portrait {
  width: 25%;
  height: auto;
}
  }