galeria.css

* {
    padding: 0;
    margin: 0;
    box-sizing: border-box;
}
body {
    font-family: Arial, sans-serif;
    font-size: 16px;
    padding: 0;
    margin: 0;
    background-color: #413543;
}
header {
    background-color: #1b1029;
    color: #bba2dc;
    text-align: center;
    padding: 16px;
}
.titulo {
    font-size: 2.5em;
    margin: 16px 0;
}
.subtitulo {
    margin: 0;
    margin-bottom: 8px;
    color: #f3f3f3;
}

.creditos::before {
    content: "Imagens ©";
    font-weight: thin;
    color: #f3f3f3;
}
.creditos {
    margin: 0;
    background: #2b1a40;
    padding: 8px 16px;
    margin-top: 16px;
    display: inline-block;
    position: absolute;
    top: 24px;
    right: 24px;
}
.creditos a {
    color: #F0EB8D;
    text-decoration: none;
    font-weight: bold;
}

/* Estiliza a seção da galeria */
#galeria {
    display: flex;
    flex-direction: row;
    flex-wrap: wrap;
    justify-content: center;
    align-items: center;
}

#imagem-principal {
    text-align: center;
    width: 90%;
    height: 1024px;
    max-height: 80vh;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    text-align: center;
    position: relative;
}
.texto-alternativo {
    color: #F0EB8D;
    padding: 16px 8px;
}
#imagem-principal img {
    max-width: 100%;
    max-height: 500px;
    margin-bottom: 20px;
}
#imagens {
    display: flex;
    flex-direction: column;
    flex-wrap: wrap;
    justify-content: center;
    align-items: center;
}
#imagens img {
    width: 100px;
    height: 100px;
    margin: 5px;
    cursor: pointer;
    border: 3px solid white;
    transition: all 0.3s ease-in-out;
}
#imagens img:hover {
    border-color: #333;
    transform: scale(1.2);
}
#imagem-principal:hover .anterior,
#imagem-principal:hover .proximo {
    display: block;
}
.anterior,
.proximo {
    display: none;
    font-size: 1em;
    background-color: #333;
    color: white;
    border: none;
    cursor: pointer;
    outline: none;
    position: absolute;
    padding: 16px;
}
.anterior span,
.proximo span {
    padding: 0 8px;
    display: none;
}
.anterior {
    left: 48px;
}
.proximo {
    right: 48px;
}
.anterior:hover,
.proximo:hover {
    background-color: #964af3;
}
.anterior:hover span,
.proximo:hover span{
    display: inline-block;
}
#imagens img.selecionada {
    border-color: #964af3;
}