html {
    background: url('img/hero.jpg') no-repeat center center fixed;
    -webkit-background-size: cover;
    -moz-background-size: cover;
    -o-background-size: cover;
     }

body {
    
    margin: 0;
    padding: 0;
    font-family: Arial, sans-serif;
    text-align: center;
    background-color: rgba(0, 0, 0, 0.637);
    
}

.a{
    color: #fff;
    text-decoration: none;
}

.container {
    width: auto;
    height: auto;
    position: relative;
    align-items: center;
}


.logo img {
    max-height: 50px;
}



.hero {
    
    color: #fff;
    
    width: 70%;
  height: 70%;
  
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  
}


.services {
    padding: 50px 0;
    text-align: center;
}

.services h2 {
    margin-bottom: 40px;
}

.service-items {
    display: flex;
    justify-content: space-around;
    flex-wrap: wrap;
}

.service-item {
    width: 30%;
    margin-bottom: 30px;
}

.service-item img {
    max-width: 100%;
    border-radius: 5px;
}

footer {
    background: #333;
    color: #fff;
    text-align: center;
    padding: 20px 0;
}

@media (max-width: 768px) {
    .service-item {
        width: 45%;
    }

    nav ul {
        flex-direction: column;
        align-items: center;
    }

    nav ul li {
        margin: 10px 0;
    }
}

@media (max-width: 480px) {
    .service-item {
        width: 100%;
    }
}