h2{
    font-size: 50px;
    font-weight: bold;
    padding-top: 2%;
    color: blue;
    margin:3%;
}

h3 {
  font-size: 200%;
  font-weight: 700;
  line-height: 155%;
  color:#d2b55b;
  margin: 3vw;
}

p {  
  font-size: 120%;
  font-weight:bold;
  line-height: 150%;
  padding: 3%;
  text-indent: 50px;
  text-align:left;
}
/* main  */
/* section-a */
#section-a{
  margin-top: 60px; 
  background-image: linear-gradient(to right, #89cfef , #effd5f);
  color:#888000;
}

.Col{
    float:left;
    width:100%;
}

.c2{ 
  position: relative;
}

.c2 img {
  width: auto;
  height: 100%;
  margin:0 auto;
}

#groupBtn{
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  -ms-transform: translate(-50%, -50%);
}
.c2 .btn {
  background-color:blue;
  color: white;
  font-size: 16px;
  padding: 16px 30px;
  border: none;
  cursor: pointer;
  border-radius: 10px;
  text-align: center;
  margin:20px 0;
  width:228px;
}
.c2 .btn:hover {
  background-color: black;
  color: white;
}
#section-a::after {
  content: "";
  clear: both;
  display: table;
} 

/* end of main */

@media (min-width: 768px) {
  /* main */
  /* section-a */
  h2{
    font-size: 5vw;
  }
  #section-a{
    margin-top: 100px;
  }
  .c1{
      width:50%;
  }
  .c2{
      width:50%;
  }
  /* end of main */
}