html, body {
    font-family: "Segoe UI", "sans-serif";
    background-color: #eee;
}

section {
    background-color: white;
    padding: 30px;
    border-radius: 20px;
    box-shadow: 0 0 15px rgba(0,0,0,0.1);
    margin: 30px 10%;
}

.data-table {
    width: 100%;
    margin: auto;
    border-collapse: collapse;
}
.form-table {
    width: 60%;
    margin: auto;
    border-collapse: collapse;
}
td, th {
    border: 1px solid #444;
    padding: 10px;
}
th {
}
.btn-cell {
    text-align: center;
}
.form-table {
    text-align: center;
}
.data-table th {

}

img {
    width: 100px;
    height: 100px;
    border-radius: 50%;
}
h1, h2 {
    text-align: center;
}

nav {
    text-align: center;
}
nav ul {
    list-style: none;
    text-align: center;
    width: 100%;
    padding: 0;
    margin: 0;
}
nav ul li {
    display: inline;
    margin: 0 5px;
    padding: 0;
    text-align: center;
}
nav a {
    text-decoration: none;
    color: black;
    padding: 10px;
    border-radius: 10px;
    transition: background-color 0.2s ease-in,
                box-shadow 0.2s ease-in;
}
nav a:hover {
    background-color: white;
    box-shadow: 0 0 5px rgba(0, 0, 0, 0.4);
}

.red-btn {
    border: 2px solid crimson;
    color:  crimson;
    box-shadow: 0 0 5px rgba(220, 20, 60, 0.4);
    transition: background-color 0.1s ease-in,
                color 0.1s ease-in;
}
.red-btn:hover {
    background-color: crimson;
    color: white;
}

.green-btn {
    border: 2px solid lightseagreen;
    color: lightseagreen;
    box-shadow: 0 0 5px rgba(46, 139, 87, 0.4);
    transition: background-color 0.1s ease-in,
                color 0.1s ease-in;
}

.green-btn:hover {
    background-color: lightseagreen;
    color: white;
}

input[type=button], input[type=submit] {
    padding: 5px 25px;
    border-radius: 15px;
    font-size: 16px;
    background-color: white;
    font-weight: bold;
    cursor: pointer;
    margin: 6px;
}
input[type=checkbox] {
    transform: scale(2);
    margin: 5px
}
input[type=text], textarea {
    width: 300px;
    height: 30px;
    font-size: 16px;
}
.picture-grid {
    display: flex;
    flex-direction: row;
    flex-wrap: wrap;
    justify-content: center;
    gap: 16px;
}

.picture-grid a {
    display: block;
    width: 250px;
    height: 250px;
}

.picture-grid img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    border-radius: 50%;
}