* {
    box-sizing: border-box;
}
/* Style the body */
body {
    font-family: Arial;
    margin: 0;
    font-size:medium
}
/* Header/logo Title */
.header {
    padding: 10px;
    text-align: center;
    /*background: #1abc9c;*/
    color: black;
    /* background-image: url("images/AtmosphereFromSpace_NASAJPL.jpg"); */
    /* background-image: url("images/NASA_JPL_header.png"); */
}

/* Increase the font size of the heading */
.header h1 {
    font-size: 20px;
}

/* Style the top navigation bar */
.navbar {
    overflow: hidden;
    /*background-color: #333;*/
    background-color: #cceeff;
    background-color: #90bed5;

}
/* Style the navigation bar links */
.navbar a {
    float: left;
    display: block;
    color: white;
    text-align: center;
    padding: 14px 20px;
    text-decoration: none;
}

/* Right-aligned link */
.navbar a.right {
    float: right;
}

/* Change color on hover */
.navbar a:hover {
    background-color: #ddd;
    color: black;
}

/* Column container */
.row {
    display: -ms-flexbox; /* IE10 */
    display: flex;
    -ms-flex-wrap: wrap; /* IE10 */
    flex-wrap: wrap;
}

/* Create two unequal columns that sits next to each other */
/* Sidebar/left column */
.side {
    flex: 30%;
    background-color: #f1f1f1;
    padding: 20px;
    margin-right: auto;
}
/* Main column */
.main {
    flex: 70%;
    background-color: white;
    padding: 20px;
}

/* Fake image, just for this example */
.fakeimg {
    background-color: #aaa;
    width: 100%;
    padding: 20px;
}

/* Fake image, just for this example */
.uooimg {
    width: 100%;
    padding: 0px;
}

/* Footer */
.footer {
    padding: 5px;
    text-align: center;
    /*background: #ddd;*/
}

/* Responsive layout - when the screen is less than 700px wide, make the two columns stack on top of each other instead of next to each other */
@media screen and (max-width: 300px) {
    .row {
        flex-direction: column;
    }
}

/* Responsive layout - when the screen is less than 400px wide, make the navigation links stack on top of each other instead of next to each other */
@media screen and (max-width: 300px) {
    .navbar a {
        float: none;
        width: 100%;
    }
}

.wrapper {overflow: auto;}

#main {margin-left: 4px;}

#leftsidebar {
    float: none;
    width: auto;
    /* width: 100px; */
}
#menulist {
    margin: 0;
    padding: 0;
}
.menuitem {
    background: #CDF0F6;
    border: 1px solid #d4d4d4;
    border-radius: 4px;
    list-style-type: none;
    margin: 4px;
    padding: 2px;
}
@media screen and (min-width: 100px) {
    #leftsidebar {width: 225px; float: left;}
    #main {margin-left: 10px;}
}
</style>
<style>
/* unvisited link */
a:link {
    color: #4477aa;
}
/* visited link */
a:visited {
    color: teal;
}
/* mouse over link */
a:hover {
    color: #cc6677;
}
/* selected link */
/* a:active {
    color: blue;
} */
div.rule {
    max-width:800px;
    margin: auto;
    border: none;
}