body {
    font-family: Arial, sans-serif;
    margin: 0;
    padding: 0;
    background-color: #ffffff;
    color: #001b04;
}

header {
    background-color: #347400;
    padding: 15px;
    position: fixed;
    width: 100%;
    top: 0;
    z-index: 1000;
}

nav ul {
    list-style: none;
    padding: 0;
    display: flex;
    justify-content: center;
}

nav ul li {
    margin: 0 15px;
}

nav ul li a {
    color: white;
    text-decoration: none;
    font-size: 18px;
    transition: color 0.3s ease;
}

nav ul li a:hover{
   color: yellow; 
}

.section {
    height: 100vh;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    text-align: center;
    padding: 20px;
}

.image-placeholder {
    width: 80%;
    height: 300px;
    margin-top: 20px;
    display: flex;
    justify-content: center;
    align-items: center;
    font-size: 20px;
    color: #666;
    background-size: cover;
    background-position: center;
}

.img1{
    background-image: url(MundoCripto.png);
    height: 310px;
    width: 270px;
}

.img2{
    background-image: url(como_funcionan_las_criptos.png);
}

.img3{
    background-image: url(btc8.jpg);
    height: 310px;
    width: 270px;
}

.img4{
    background-image: url(riesgos_de_las_criptomonedas.png);
}

.img5{
    background-image: url(futuro_cripto.png);
}