* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}
body{
    background-image: url(../dumbbell-1966702_1280.jpg);
 background-size: cover;
    
}
header {
    padding: 20px;
    border: 2px solid #ffffff;
    margin-bottom: 10px;
    text-align: center;
    background-color: #000000;
    color: white;
  
}


nav {
    padding: 17px;
    border: 1px solid #fdecec;
    outline: 2px solid #000000;
    margin-bottom: 20px;
    background-color: #fdfcfc;
}

nav ul {
    list-style: none;
    display: flex;
    justify-content: center;
}

nav ul li {
    margin: 0 10px;
}

nav ul li a {
    text-decoration: none;
    color: #2c3e50;
    font-weight: bold;
}


main {
    padding: 15px;
    border: 3px solid #000000;
    outline: 1px solid #fdfdfd;
    margin-top: 20px;
    background-color: #000000;
    color: rgb(0, 0, 0);
  
}


section {
    text-align: center;
    margin-bottom: 30px;
    background-color: #e1e7ee;
    padding: 14px;
}


.membership-card {
    padding: 20px;
    border: 2px solid #f1c40f;
    outline: 1px solid #16a085;
    margin: 20px;
    background-color: #f2f9fc;
    text-align: center;
}

.membership-card h3 {
    color: #e91d1d;
    background-color: #e7e7e7;
}


footer {
    padding: 10px;
    border: 2px solid #9b59b6;
    margin-top: 20px;
    text-align: center;
    background-color: #ecf0f1;
}