.dropbtn {
    background-color: #3498DB;
    color: white;
    padding: 16px;
    font-size: 16px;
    border: none;
    cursor: pointer;
    width: 100%;
}
.dropbtn:hover, .dropbtn:focus {
    background-color: #2980B9;
}
.dropdown {
    position: relative;
    display: inline-block;
}
.dropdown-content {
    display: none;
    position: absolute;
    background-color: #f1f1f1;
    width: calc(100% - 16px);
    overflow: auto;
    box-shadow: 0px 8px 16px 0px rgba(0,0,0,0.2);
    z-index: 1;
}
.dropdown-content a {
    color: black;
    padding: 12px 16px;
    text-decoration: none;
    display: block;
}
.dropdown a:hover {background-color: #ddd}
.show {display:block;}
}
* {
    box-sizing: border-box;
}
.column {
    float: left;
    width: 50%;
}
.row:after {
    content: "";
    display: table;
    clear: both;
}