:root {
    --main-bg-color: #E0E0E0;
    --main-text-color: #525252;
    --main-accent-color: #1faeff;
}

.button {
    background-color: #525252;
    border: none;
    color: white;
    padding: 17px 0px;
    text-align: center;
    text-decoration: none;
    position:relative;
    font-size: 16px;
    margin: 0px -3px 0px -3px;
    cursor: pointer;
    transition-duration: 0.4s;
    font-family: "Calibri", "Arial";
    width: 170px;
}
.button:hover, .button:focus  {
    box-shadow: 0 12px 16px 0 rgba(0,0,0,0.24),0 17px 50px 0 rgba(0,0,0,0.19);
    z-index: 99999;
}
div.ex2 {
    max-width:500px;
    margin: auto;
}
.dropbtn {
    background-color: rgb(31, 174, 255);
    border: none;
    color: white;
    padding: 15px 0px;
    text-align: center;
    text-decoration: none;
    position:relative;
    font-size: 24px;
    margin: 0px -2px;
    cursor: pointer;
    transition-duration: 0.4s;
    font-family: "Calibri", "Arial";
    width: 219px;
}
.dropbtn:hover, .dropbtn:focus {
    box-shadow: 0 12px 16px 0 rgba(0,0,0,0.24),0 17px 50px 0 rgba(0,0,0,0.19);
    z-index: 99999;
}
.dropdown {
    position: relative;
    display: inline-block;
}
.dropdown-content {
    display: none;
    position: absolute;
    background-color: #f9f9f9;
    min-width: 219px;
    overflow: auto;
    box-shadow: 0px 12px 16px 0px rgba(0,0,0,0.2);
    margin: 0px -2px;
    z-index: 999999;
}
.dropdown-content a {
    color: black;
    padding: 12px 16px;
    text-decoration: none;
    display: block;
    font-size: 16px;
}
.dropdown a:hover {
  background-color: #f1f1f1
}
.show {
  display:block;
}