* {
  margin: 0;
  padding: 0;
  font-family: Century Gothic;
}
header {
  background-image: linear-gradient(rgba(0, 0, 0, 0.5), rgba(0, 0, 0, 0.5)),
    url(landscape-forest-lake-water-nature-grass-704469-wallhere.com.jpg);
  height: 100vh;
  background-size: cover;
  background-position: center;
  min-height: 100px;
}
ul {
  float: right;
  list-style-type: none;
  margin-top: 30px;
  margin-right: 60px;
}
ul li {
  display: inline-block;
}
ul li a {
  text-decoration: none;
  color: #128c90;
  padding: 5px 20px;
  border: 1px solid transparent;
  transition: 0.5s ease;
}

ul li a:hover {
  background-color: #149f3e;
  color: #000;
}

ul li.active a {
  background-color: #168148;
  color: #000;
}

.logo img {
  float: left;
  width: 150px;
  height: auto;
}

.main {
  max-width: 1200px;
  margin: auto;
}

.title {
  position: absolute;
  top: 40%;
  left: 50%;
  transform: translate(-50%, -50%);
}

.title h1 {
  color: #10708e;
  font-size: 85px;
}

.button {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
}

.btn {
  border: 1px solid #157f73;
  padding: 5px 20px;
  color: #183486;
  transition: 0.6s ease;
  font-size: 18px;
  text-decoration: none;
}

.btn:hover {
  background-color: #187e4e;
  color: #000;
}

.sub-menu {
  display: none;
  top: 6%;
  position: relative;
}

.sub-menu ul {
  position: absolute;
}

.main ul li:hover .sub-menu {
  display: block;
  position: absolute;
  background-color: rgb(0, 45, 117);
  margin-top: 12px;
  margin-left: -8px;
}

.main ul li:hover .sub-menu ul {
  display: block;
  margin: 6px;
}
.main ul li:hover .sub-menu ul li {
  width: 75px;
  padding: 5px;
  border-bottom: 1px#095a77;
  background: transparent;
  transition: 0.4s ease;
  text-align: left;
  border-radius: 0;
}

.main ul li:hover .sub-menu ul li:last-child {
  border-bottom: none;
}