css

*{
    margin: 0;
    padding: 0;
    font-family: sans-serif;
}

header{
    background-image:linear-gradient(rgba(0,0,0,0.5),rgba(0,0,0,0.5)), url(../images/theme.jpg);
    height:100vh;
    background-size:cover;
    background-position:center;
}

ul{
    list-style-type:none;
    float:right;
    margin-top:20px;
}

ul li{
    display: inline-block;
    
}

ul li a {
    text-decoration: none;
    color:aliceblue;
    padding: 5px 20px;
    border: 1px solid transparent;
    transition:0.6s ease;
}

ul li a:hover{
    background-color: rgb(225, 190, 115);
    color: rgb(37, 40, 39);
}

ul li.active a{
    background-color: rgb(225, 190, 115);
    color: rgb(37, 40, 39);
}

.logo img{
    float:left;
    width:200px;
    height: auto;
    margin: 5px;
}

.main{
    max-width: 1300px;
    margin: auto;
}

.title{
    position:absolute;
    top:50%;
    left:50%;
    transform:translate(-50%, -50%);
}

.title h1{
    color: white;
    font-size: 70px;
}

.button{
    position:absolute;
    top:60%;
    left:50%;
    transform:translate(-50%, -50%); 
}

.btn{
    border: 1px solid white;
    padding: 15px 30px;
    color:white;
    text-decoration:none;
    transition:0.6s ease;
}

.btn:hover{
    background-color: rgb(225, 190, 115);
    color: rgb(37, 40, 39);
}