html {
    background: #e6f2e6;
}
  
body {
    display: flex;
    flex-direction: column;
    font-family: Arial, Helvetica, sans-serif;
    min-width: 100px; 
    max-width: 1500px;
    margin: 20px auto;
    padding: 0 20px;
    font-size: 16pt;
    line-height: 1.6;
    background: #ffffff;
    color: #2c3e1f;
    border-radius: 10px;
    box-shadow: 0 0 15px rgba(0,0,0,0.15);
    min-height: 100vh;
}
  
header {
    font-family: Verdana, Geneva, Tahoma, sans-serif;
    text-align: center;
    padding: 20px 0;
    background-color: #2e7d32;
    background-size: cover;
    background-position: center;
    color: #f5f5f5;
    margin-bottom: 20px;
    border-radius: 10px 10px 0 0;
}

footer {
    text-align: center;
    padding: 15px 0;
    background-color: #2caf33;
    color: #f5f5f5;
    font-style: italic;
    margin-top: auto;
    border-radius: 0 0 10px 10px;
}
  
nav {
    text-align: center;
    margin-bottom: 20px;
}
  
nav a {
    display: inline-block;
    color: #1b5e20;
    text-decoration: none;
    border: 2px solid #4caf50;
    padding: 10px 20px;
    border-radius: 20px;
    margin: 0 15px;
    transition: 0.3s;
}
  
nav a:hover {
    background-color: #4caf50;
    color: white;
}
  
  nav a.currentpage {
    border-color: #1b5e20;
    background-color: #1b5e20;
    color: #ffffff;
}
  
img {
    max-width: 300px;
    height: auto;
    display: block;
    border: 5px solid #4caf50;
    margin: 10px auto;
    border-radius: 10px;
    box-shadow: 0 0 10px rgba(0,0,0,0.4);
    transition: transform 0.3s;
}
  
img:hover {
    transform: scale(1.05);
}
  
iframe {
  max-width: 500px;
  max-height: 300px;
  border: 5px solid #4caf50;
  border-radius: 10px;
  box-shadow: 0 0 10px rgba(0,0,0,0.4);
}
table {
    width: 100%;
    border-collapse: collapse;
    margin: 15px 0;
    font-family: Arial, sans-serif;
}
  
th, td {
    border: 1px solid #2e7d32;
    padding: 10px 12px;
    text-align: left;
}
  
th {
    background-color: #a5d6a7;
    color: #1b5e20;
}
  
tr:nth-child(even) {
    background-color: #f1f8e9;
    color: #2c3e1f;
}
  
ul {
    margin-top: 10px;
    padding-left: 20px;
}
  
a {
    color: #2e7d32;
    font-weight: bold;
}
  
a:hover {
    color: #ff6f00;
}
  
* {
    box-sizing: border-box;
}
  
.header {
    text-align: center;
    padding: 32px;
}
  
.row {
    display: flex;
    flex-wrap: wrap;
    padding: 0 4px;
}
  
.column {
    flex: 50%;
    padding: 0 4px;
}
  
.column img {
    margin-top: 8px;
    vertical-align: middle;
}
  
.btn {
    border: none;
    outline: none;
    padding: 10px 16px;
    background-color: #f1f1f1;
    cursor: pointer;
    font-size: 18px;
}
  
.btn:hover {
    background-color: #ddd;
}
  
.btn.active {
    background-color: #666;
    color: white;
}