ul {
          list-style-type: none;
          margin: 0;
          padding: 0;
          overflow: hidden;
          background-color: #f3f3f3;
      }

      li {
          float: left;
      }

      ul.gray {
        border: 1px solid #e7e7e7;
          background-color: #f3f3f3;
      }
      
      ul.gray li.av a {
          display: block;
          color: #666;
          text-align: center;
          padding: 14px 16px;
          text-decoration: none;
      }

      ul.gray li.s a {
          display: block;
          color: #666;
          text-align: center;
          padding: 14px 16px;
          text-decoration: none;
      }

      ul.gray li.av img {
          display: block;
          color: #666;
          text-align: center;
          text-decoration: none;
      }
      
      ul.gray li.av a:hover:not(.active) {
          background-color: #ddd;
      }

      ul.gray li.acc a {
          background-color: #ddd;
      }
      
      ul.gray li.av a.active {
          color: white;
          background-color: #008CBA;
      }

      .rightli {
        float:right;
      }


.btn {
  position: absolute;
  transform: translate(-50%, -50%);
  -ms-transform: translate(-50%, -50%);
  background-color: #555;
  color: white;
  font-size: 16px;
  padding: 12px 24px;
  border: none;
  cursor: pointer;
  border-radius: 5px;
}

.btn:hover {
  background-color: black;
}

.rounded-image {
width: 200px;
height: 200px;
border-radius: 10px;
}

h1{
  text-align: center;
}

h2{
  text-align: center;
}

h3{
  text-align: center;
}

h4{
  text-align: center;
}

p{
  text-align: center;
}

.form-control {
  position: relative;
  margin: 20px 0 40px;
  width: 190px;
  text-align: center;
}

.form-control input {
  background-color: transparent;
  border: 0;
  border-bottom: 2px #000 solid;
  display: block;
  width: 100%;
  padding: 15px 0;
  font-size: 18px;
  color: #000;
}

.form-control input:focus,
.form-control input:valid {
  outline: 0;
  border-bottom-color: #000;
}

.form-control label {
  position: absolute;
  top: 15px;
  left: 0;
  pointer-events: none;
}

.form-control label span {
  display: inline-block;
  font-size: 18px;
  min-width: 5px;
  color: #000;
  transition: 0.3s cubic-bezier(0.68, -0.55, 0.265, 1.55);
}

.form-control input:focus+label span,
.form-control input:valid+label span {
  color: #000;
  transform: translateY(-30px);
}