body {
    font-family: Tahoma, Geneva, sans-serif;
    font-size: 80%;
    color: white;
    background-color: black;
    animation: fadein 2s;
}

@keyframes fadein {
    from {
        opacity: 0;
    }
    to {
        opacity: 1;
    }
}

#copyright {
    background-color: rgba(0, 0, 0, 0.6);
    color: #aaa;
    font-size: 75%;
    border-bottom-right-radius: 5px;
}

#background-image-author {
    background-color: rgba(0, 0, 0, 0.6);
    color: #aaa;
    font-size: 75%;
    border-bottom-left-radius: 5px;
}

/** navigation menu **/
#navigation {
    background-color: rgba(0, 0, 0, 0.9);
    text-align: center;
}

#navigation a {
    color: #4c7cbd;
}

/** index.php **/
#history-content #photo {
    border-radius: 10px;
}

#history-content #vita {
    border-radius: 10px;
    background-color: rgba(0, 0, 0, 0.5);
    backdrop-filter: blur(2px);
}

/** imprint.php **/
#imprint-content {
    border-radius: 10px;
    background-color: rgba(0, 0, 0, 0.5);
    backdrop-filter: blur(2px);
}

/** contact.php **/
#contact-content {
    border-radius: 10px;
    background-color: rgba(0, 0, 0, 0.5);
    backdrop-filter: blur(2px);
}

form {
    border-radius: 5px;
    padding: 20px;
}

form input, form textarea, form select {
    width: 100%;
    background-color: #00000080;
    color: white;
    padding: 12px;
    border: 1px solid #686868;
    border-radius: 4px;
    box-sizing: border-box;
    margin-top: 6px;
    margin-bottom: 16px;
    resize: vertical;
}

form textarea {
    height: 10em;
}

form button {
    background-color: #ffffffa8;
    color: black;
    padding: 12px 20px;
    border: none;
    border-radius: 4px;
    cursor: pointer;
}

form button:disabled {
    background-color: #7d7d7d40;
    color: #ffffff59;
    cursor: default;
}

form button:not([disabled]):hover {
    background-color: #ffffffa8;
    color: black;
}

/** content tables **/
.content-table {
    border-spacing: 0.5em;
}

.content-table-col-title {
    font-weight: bolder;
    text-align: right;
    vertical-align: top;
    padding: 0;
}

.content-table-col-text {
    text-align: left;
    padding: 0 0 0 1em;
}

/** lists **/
ul {
    list-style: circle;
}

ul li {
    padding-bottom: 0.5em;
}

/** links **/
a {
    color: white;
    outline: none;
}

a:hover {
    text-decoration: none;
}

/** settings for displaying on mobile device **/
@media (orientation: portrait) {
    body {
        font-size: 80%;
    }
}