h1 {
    color: aquamarine;
    text-decoration: cadetblue;
}
h2 {
    color:darkcyan;
    text-decoration: darkmagenta;
}
p1 {
    color:darkseagreen;
    border: darkturquoise;
    padding: 50px;
}
img:hover {
    opacity: 0.8;
}
div{
    background-color: cadetblue;
    padding: 20%;
}
div.first {
    opacity: 0.1;
}
div.second {
    opacity: 0.3;
}
div.third {
    opacity: 0.6;
}
.dropdown {
    position: relative;
    display: inline-block;
}
.dropdown-content {
    display: none;
    position: absolute;
    background-color: palegreen;
    min-width: 160px;
    box-shadow: 0px 10px 16px 0px;
    padding: 12px 16px;
    z-index: 1;
}
.dropdown:hover .dropdown-content {
    display: block;
}