* { box-sizing: border-box; }

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


#wrapper {
    width: 80%;
    margin-left: auto;
    margin-right: auto;
    border: thin solid black;
}


header {
    margin: 10px;
    padding: 10px;
    background-color: #555;
    color: white;
}
header > img {
    width: 20%;
    height: auto;
    float: right;
}
.clearright {
    clear: right;
}


nav {
    display: flex;
    justify-content: center;
    text-align: center;
    flex: 1;
}
nav > div {
    background-color: #f1f1f1;
    margin: 10px;
    padding: 10px 20px;
    font-size: 20px;
}
nav > div > a {
    color: steelblue;
    font-weight: bold;
    text-decoration: none;
}
nav > div > a:hover {
    color: royalblue;
    text-decoration: underline;
}


main {
    display: flex;
}
main > div {
    background-color: #f1f1f1;
    margin: 10px;
    padding: 10px;
    width: 100%;
}


:focus {
    outline: 3px solid #000;
}
td, th {
    border: 1px solid #dddddd;
    text-align: left;
    padding: 8px;
}
tr:nth-child(even) {
    background-color: whitesmoke;
}
label {
    float: left;
    display: block;
    text-align: right;
    width: 10em;
    padding-right: 1em;
}
input, textarea {
    display: block;
    margin-bottom: 2em;
}


fieldset {
    margin-left: 11em;
    margin-bottom: 2em;
    padding: 1em;
}
fieldset label {
    float: none;         
    display: inline;    
    width: auto;
    text-align: left;
    padding: 0;
}
fieldset input[type="radio"] {
    display: inline;
    margin-right: 5px;
}


input[type="submit"], input[type="reset"] {
    width: 120px;
    padding: 8px;
    margin-top: 10px;
    border: none;
    border-radius: 4px;
    color: white;
    cursor: pointer;
}


input[type="submit"] {
    background-color: #0077cc;
}
input[type="submit"]:hover {
    background-color: #005fa3;
}


input[type="reset"] {
    background-color: #777;
}
input[type="reset"]:hover {
    background-color: #555;
}


.button-group {
    display: flex;
    flex-direction: column;
    margin-left: 14em;      
    gap: 10px;              
}


footer {
    background-color: gainsboro;
    margin: 10px;
    padding: 10px;
}
footer p {
    text-align: center;
}