body {
    background-color: #efeded;
    padding: 0;
    margin: 0;
    font-family : 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    line-height: 1.6;
    color: #333;
}

header {
    background-image: url("images/solar_system-background.jpg");
    background-position-y: center;
    padding: 50px;
    margin: 0;
    color: white;
    text-align: center;
    background-size: cover;
}

nav a{
    text-decoration: none;
    display: inline-block;
    padding: 10px;
    margin: 10px;
    font-weight: bold;
    color: #333;
}
nav{
    text-align: center;
    margin-bottom: 10px;
    margin-top: 10px;
}

nav a:hover{
    background-color: #ffffff;
    border-radius: 15px;
    cursor: pointer;
}

section{
    padding: 20px;
    margin: 20px auto;
    max-width: 800px;
    background-color: white;
    border-radius: 10px;
    box-shadow: 0 0 10px rgba(0, 0, 0, 0.1);
}

.Images_Planètes{
    width: 100%;
}

footer{
    text-align: center;
}

table{
    width: 60%;
    margin: auto;
    border-collapse: collapse;
}

th{
    background-color: #0d9bf3;
    color: white;
    font-weight: bold;
}

td{
    background-color: white;
}

th, td{
    text-align: center;
    border: 1px solid #dddadb;
    padding: 15px;
}

form{
    padding: 30px;
    margin: 15px auto;
    max-width: 500px;
    background-color: white;
    border-radius: 10px;
    box-shadow: 0 0 10px rgba(0, 0, 0, 0.1);
    color: black;
    font-weight: bold;
}

#tableau{
    padding: 20px;
    margin: 10px auto;
}

label{
    display: block;
}

input, textarea{
    display: block;
    border-radius: 8px;
    border: 1px solid #ccc;
    width: 100%;
    padding: 10px;
}

button{
    background-color: #0d9bf3;
    color: white;
    font-weight: bold;
    border-radius: 5px;
    border: none;
    padding: 15px;
}