cancer.css

*{
  margin:0;
  padding:0;
  font-family:verdana;
}
a{
  color:000;
  text-decoration: none;
}
a:hover{
color: white;
text-decoration: none;
}
.btn {
  background-color:white;
  border: none;
  color: black;
  padding: 12px 30px;
  cursor: pointer;
  font-size: 20px;
  border-radius: 35px;
  text-align: center;
}
.btn:hover {
  background-color: #616A6B;
  color: white;
}
#abc{
  width:100%;
  height:100vh;
  background-image: url(cancer2.jpg);
  background-size:cover;
}
nav{
  width: 100%;
  height: 50px;
  background-color: #0000;
  line-height: 50px;
}
nav ul{
  float: right;
  margin-right: 30px;
}
nav ul li{
  list-style-type: none;
  display: inline-block;
  transition: 0.7s all;
}
nav ul li:hover{
  background-color:#616A6B;
}
nav ul li a{
  text-decoration: none;
  color: #fff;
  padding: 30px;
}

.dropdown-content {
    display: none;
    position: absolute;
    background-color: #616A6B;
    min-width: 205px;
    box-shadow: 0px 8px 16px 0px rgba(0,0,0,0.5);
}

.dropdown-content a {
    color: white;
    padding: 10px 23px;
    text-decoration: none;
    display: block;
    text-align: left;
}

.dropdown-content a:hover {background-color:#797D7F}

.dropdown:hover .dropdown-content {
    display: block;
}

.dropdown-content1 {
    display: none;
    position: absolute;
    background-color: #616A6B;
    min-width: 123px;
    box-shadow: 0px 8px 16px 0px rgba(0,0,0,0.5);
}

.dropdown-content1 a {
    color: white;
    padding: 10px 23px;
    text-decoration: none;
    display: block;
    text-align: left;
}

.dropdown-content1 a:hover {background-color:#797D7F}

.dropdown1:hover .dropdown-content1 {
    display: block;
}