styles.css

@import url('https://fonts.googleapis.com/css2?family=Montserrat:wght@500&display=swap');

body {
 box-sizing: border-box;
 margin: 0;
 padding: 0;
 background-color: gray;
 background-image: url("images/WIN_20210729_13_50_20_Pro.jpg");
 height: 500px; /* You must set a specified height */
 background-position: center; /* Center the image */
 background-position: top;
 background-repeat: no-repeat; /* Do not repeat the image */
 background-size: cover; /* Resize the background image to cover the entire container */
 --main-bg-color: #24252A;
}

li, a, button, header, .logo{
    background-color: var(--main-bg-color);
}



li, a, button {
    font-family: 'Montserrat', sans-serif;
    font-weight: 500;
    font-size: 16px;
    color: #edf0f1;
    text-decoration: none;
}

header {
    display: flex;
    justify-content: flex-start;
    padding: 30px 10%;
}

.logo {
    border-color: cadetblue;
    border: 5px;
    border-radius: 50px;
    cursor: pointer;
    margin-right: auto;
}

.nav_links {
    list-style: none;
}

.nav_links li {
    display: inline-block;
    padding: 0px 20px;
}

.nav_links li a {
    transition: all 0.3s ease 0s;
}

.nav_links li a:hover {
    color: #0088a9;
}

button {
    margin-left: 20px;
    padding: 9px 25px;
    background-color: rgba(0,136,169,1);
    border: none;
    border-radius: 50px;
    cursor: pointer;
    transition: all 0.3s ease 0s;
}

button:hover {
    background-color: rgba(0,136,169,0.8);
}