Below is my code:
* {
margin: 0;
padding: 0;
box-sizing: border-box;
}
html, body {
width: 100%;
height: 100%;
}
.lbox {
visibility: hidden;
opacity: 0;
}
ul {
width: 800px auto ;
list-style: none;
display: flex;
margin: 100px auto;
}
.min {
width: 150px;
padding: 10px;
}
.lbox:target {
opacity: 1;
visibility: visible;
width: 100%;
height: 100%;
top: 0;
left: 0;
position: fixed;
text-align: center;
background-color: rgba(10,10,10,0.7);
}
.box-img {
width: 1000px;
margin: 150px auto;
}
.btn {
color: #fff;
font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
text-decoration: none;
position: absolute;
width: 50px;
height: 50px;
font-size: 40px;
text-align: center;
}
#prev {
left: 5%;
top: 45%;
}
#next {
right: 5%;
top: 45%;
}
#close {
top: 0;
right: 2px;
}
.box-img img {
opacity: 0;
}
.lbox:target .box-img img {
opacity: 1;
transition: opacity 250ms linear;
}
<h2>Quarto 1<h2>
<ul>
<li><a href="#img1"><img src="3cama.html" alt="" class="min"></a></li>
<li><a href="#img2"><img src="quartdo.html" alt="" class="min"></a></li>
<li><a href="#img3"><img src="quartoun.html" alt="" class="min"></a></li>
<li><a href="#img4"><img src="quartsou.html" alt="" class="min"></a></li>
<li><a href="#img5"><img src="quartuno.html" alt="" class="min"></a></li>
<li><a href="#img6"><img src="quarto.html" alt="" class="min"></a></li>
<li><a href="#img7"><img src="quartum.html" alt="" class="media"></a></li>
<li><a href="#img8"><img src="varan.html" alt="" class="min"></a></li>
</ul>
<div class="lbox" id="img1">
<div class="box-img">
<a href="#img8" class="btn" id="prev">«</a>
<a href="#" class="btn" id="close">X</a>
<img src="3cama.html" alt="">
<a href="#img2" class="btn" id="next">»</a>
</div>
</div>
<div class="lbox" id="img2">
<div class="box-img">
<a href="#img1" class="btn" id="prev">«</a>
<a href="#" class="btn" id="close">X</a>
<img src="quartdo.html" alt="">
<a href="#img3" class="btn" id="next">»</a>
</div>
</div>
<div class="lbox" id="img3">
<div class="box-img">
<a href="#img2" class="btn" id="prev">«</a>
<a href="#" class="btn" id="close">X</a>
<img src="quartoun.html" alt="">
<a href="#img4" class="btn" id="next">»</a>
</div>
</div>
<div class="lbox" id="img4">
<div class="box-img">
<a href="#img3" class="btn" id="prev">«</a>
<a href="#" class="btn" id="close">X</a>
<img src="quartsou.html" alt="">
<a href="#img5" class="btn" id="next">»</a>
</div>
<div class="lbox" id="img5">
<div class="box-img">
<a href="#img4" class="btn" id="prev">«</a>
<a href="#" class="btn" id="close">X</a>
<img src="quartuno.html" alt="">
<a href="#img6" class="btn" id="next">»</a>
</div>
</div>
<div class="lbox" id="img6">
<div class="box-img">
<a href="#img5" class="btn" id="prev">«</a>
<a href="#" class="btn" id="close">X</a>
<img src="quarto.html" alt="">
<a href="#img7" class="btn" id="next">»</a>
</div>
<div class="lbox" id="img8">
<div class="box-img">
<a href="#img7" class="btn" id="prev">«</a>
<a href="#" class="btn" id="close">X</a>
<img src="varan.html" alt="">
<a href="#img1" class="btn" id="next">»</a>
</div>
</div>
Then I just repeated everything by changing the photos and their numbers.