@media (max-width: 600px) {
    .top-menu {
        display: none;
    }
    .topmenu li {
        width: 100%;
    }
    footer li {
        width: 100%;
        display: inline-block;
        padding: 5px;
    }
}

@media (min-width: 600px) {
    .topmenu li a {
        padding: 0;
        margin: 0;
    }
}
body {
    margin-top: 0px;
}

.top-menu {
    width: 100%;
    padding: 20px;
    background-color: #253c70;
}

.top-menu a {
    font-family: Arial, Helvetica, sans-serif;
    font-size: small;
    font-weight: normal;
    line-height: 0.5;
    color: white;
    float: right;
}

.top-menu a:first-child {
    margin-right: 50px;
}

main {
    max-width: 1200px;
    margin: 50px auto;
}

header {
    font-family: Arial, Helvetica, sans-serif;
    font-size: 205%;
    font-weight: bold;
    margin-bottom: 0px;
    clear: right;
}

header img {
    float: left;
    padding: 0;
    margin-top: -25px;
}

header h3 {
    max-width: 535px;
    padding: 10px;
    border-top: 1px solid black;
    font-family: Arial, Helvetica, sans-serif;
    font-size: 55%;
}

h1 {
    font-family: Arial, Helvetica, sans-serif;
}

h2 {
    color: #3492eb;
    font-family: Arial, Helvetica, sans-serif;
}

h3 {
    font-family: Arial, Helvetica, sans-serif;
    font-size: 110%;
    margin: 5px;
}

.topmenu {
    list-style-type: none;
    padding: 0px;
    margin: 30px 0px 100px 0px;
}

.topmenu li  {
    padding: 20px;
    margin-top: 5px;
    box-sizing: border-box;
    background-color: #3492eb;
}

.topmenu li:first-child {
    background-color: green;
}

.topmenu li:hover {
    box-sizing: border-box;
    background-color: #253c70;
}

.topmenu a {
    padding: 20px;
    margin: 0px;
    color: white;
    text-decoration: none;
}

.topmenu a:hover {
    color: white;
    background-color: #253c70;
}

.topmenu li a:visited {
    color: white;
}

li {
    list-style-type: none;
    font-family: Arial, Helvetica, sans-serif;
    display: inline-block;
}

/* Remove this li 
li {
    font-family: Arial, Helvetica, sans-serif;
    display: inline-block;
    margin: 0px auto;
} . */

article {
    margin: 25px auto;
}

a {
    text-decoration: none;
    font-family: Arial, Helvetica, sans-serif;
    margin-right: 25px;
    color: black;
}

.volgende {
    float: right;
    margin-right: 50px;
}

div {
    margin: 10px;
    float: left;
}

/* deze worden gebruikt voor de toegangscode*/
form {
    width: 1200px;
    height: 100px;
    margin: 50px auto;
}

input {
    width: 125px;
    height: 40px;
    background-color: lightgray;
    font-family: Arial, Helvetica, sans-serif;
    font-size: 150%;
    padding-left: 10px;
}

.verzenden {
    width: 125px;
    height: 40px;
    background-color: #3492eb;
    color: white;
    font-family: Arial, Helvetica, sans-serif;
    font-size: small;
}

button {
    float: right;
    margin: 50px;
    font-family: Arial, Helvetica, sans-serif;
    font-size: medium;
    padding: 5px;
    border: 1px solid black;
    border-radius: 5px;
    width: 150px;
    height: 30px;
    color: white;
    background-color: #3492eb;
}

p  {
    font-family: Arial, Helvetica, sans-serif;
    font-size: 150%;
}

b {
    color:#3492eb;
}

/*css voor pagina inkoopboek.php*/
.werkboek {
    clear: right;
}

.foutecode {
    color: red;
}

table {
    width: 75%;
    margin: 50px auto;
    font-family: Arial, Helvetica, sans-serif;
    font-size: 150%;
    border: 1px solid black;
    padding: 5px;
}

td {
    width: 250px;
    border: 1px solid black;
    padding: 5px;
}

th {
    text-align: left;
    font-family: Arial, Helvetica, sans-serif;
    font-size: 100%;
    border: 1px solid black;
    padding: 5px;
}

footer {
    padding: 5px;
    background-color: #253c70;
    margin-top: 20px;
}

footer a {
    color: white;
}

.copyright {
    font-family: Arial, Helvetica, sans-serif;
    font-size: medium;
    text-align: center;
}