body {
    background-color: whitesmoke;
    color: #555;
    font-family: Arial, Helvetica, sans-serif;
    font-size: 16px;
    line-height: 1.6em;
    margin: 0;
}

.container {
    width: 90%;
    margin: auto;
    overflow: hidden;
}

#main-header {
    background-color: #3d91cc;
    color: white;
    font-size: large;
}

#navbar {
    background-color: #333;
    color: white;
}

#navbar ul {
    padding: 0px;
    list-style: none;
}

#navbar li {
    display: inline;
}

#navbar a {
    color: white;
    text-decoration: none;
    font-size: 18px;
    padding-right: 20px;
}

#navbar a:hover {
    color: #3d91cc;
}

#main a {
    text-decoration: underline;
    color: #555;
    font-weight: bold;
}

#main a:hover, a:active {
    color: #3d91cc;
}

/* Create two unequal columns that floats next to each other */
/* Left column */
.leftcolumn { 
    float: left;
    width: 75%;
}
  
/* Right column */
.rightcolumn {
    float: right;
    width: 25%;
    /* padding-left: 20px; */
}

.leftcolumn .card {
    margin-right: 20px;
}

.card {
    background-color: white;
    padding: 20px;
    margin-top: 20px;
}

.row:after {
    content: "";
    display: table;
    clear: both;
}

#main-footer {
    background-color: #333;
    color: white;
    text-align: center;
    padding: 20px;
    margin-top: 40px;
}

/* Experimentation Below Here */

.responsive {
    width: 100%;
    height: auto;
    margin-left: auto;
    margin-right: auto;
    display: block;
}

html, body { height: 100%;}

body > footer {
  position: sticky;
  top: 100vh;
}

/* Responsive layout - when the screen is less than 800px wide, make the two columns stack on top of each other instead of next to each other */
@media screen and (max-width: 800px) {
    .leftcolumn, .rightcolumn { 
      width: 100%;
      padding: 0;
      margin: 0;
    }

    .leftcolumn .card {
        margin-right: 0;
    }
}