body {
    margin: 0;
    background-color: #111;
    color: wheat;
    font-family: Arial, Helvetica, sans-serif;
}
p{
  max-width: 400px;
  margin-top: 50px;
}

/* nav styles */
:root {
    --nav_bg_color: white;
    --nav_hover_color: #ccc;
    --nav_height: 50px;
    --nav_item_width: auto;
}

.logo {
    padding: 0 1em;
    float: left;
}
.logo img{
    height: 48px;
}
.logo:hover{
    opacity: 0.9;
}
nav {
    height: var(--nav_height);
    position: fixed;
    background-color:var(--nav_bg_color);
    width: 100%;
    top: 0;
    font-family: Arial, Helvetica, sans-serif;
}
nav ul {
    width: fit-content;
    width: -moz-fit-content;
    list-style-type: none;
    margin: 0 0 0 auto;
    padding: 0;
    overflow: hidden;
}

nav ul li {
    float: left;
    width: var(--nav_item_width);
}

nav ul li a, .burger {
    box-sizing: border-box;
    display: block;
    color: #000000;
    text-align: center;
    padding: 16px 25px;
    text-decoration: none;
    height: var(--nav_height);
}

nav ul li a:hover, .burger:hover {
    background-color: var(--nav_hover_color);
}
#menu_box{
    display: none;
}
.burger{
    cursor: pointer;
    float: right;
    font-size: 2em;
    line-height:0.6em;
    display: none;
    margin-left:auto;
    text-align: right;
}
@media screen and (max-width: 800px) {
    .burger{
        display: block;
    }
    .burger::before{
        content: '\2261'; /* ≡-icon*/
    }
    /* add */
    #menu_box:checked ~ .burger::before{
    content: '\00D7'; /* ×-icon*/
    }

    nav ul{
        display: none;
        clear: both;
        margin-right: 0;
        background-color: inherit;
        max-height: 80vh;
        overflow-y: auto;
    }
    nav ul li{
        float: none;
        display: block; /* change to block */

    }
    nav ul li a{
        text-align: left;
        width:var(--nav_item_width);
    }
    .logo{
        margin-left: 0;
    }
    #menu_box:checked ~ ul {
        display: block;
        }
}