* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Calibri', Arial, sans-serif;
    line-height: 1.6;
    background-color: #f5f5f5;
	max-width: 900px;
    margin: 0 auto;
}

nav {
    display: flex;
    justify-content: center;
    align-items: center;
    flex-direction: column;
    background-color: #333;
    padding: 20px;
}

.logo {
    height: 100px;
    width: auto;
    flex-shrink: 0;
    margin-bottom: 30px;
}

.menu {
    display: flex;
    list-style: none;
    justify-content: center;
}

.menu-item {
    position: relative;
}

.menu-item > a {
    display: block;
    padding: 0 10px;
    color: #fff;
    text-decoration: none;
}

.menu-item:hover > a {
    background-color: #555;
}

.submenu {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    min-width: 150px;
    background-color: #333;
    list-style: none;
}

.submenu a {
    display: block;
    padding: 20px 20px;
    text-decoration: none;
    color: #fff;
}

.submenu a:hover {
    background-color: #555;
}

.menu-item:hover > .submenu {
    display: block;
}

.burger-menu {
    display: none;
    width: 30px;
    height: 20px;
    flex-direction: column;
    justify-content: space-between;
    cursor: pointer;
}

.burger-menu:before,
.burger-menu:after {
    content: "";
    display: block;
    height: 4px;
    width: 100%;
    background-color: #fff;
}

@media screen and (max-width: 600px) {
    .menu {
        display: none;
    }

    .burger-menu {
        display: flex;
    }
	
}

main {
    padding: 20px;
}

article {
    background-color: #fff;
    padding: 20px;
    margin-bottom: 20px;
    border-radius: 5px;
}

.placeholder-img {
    display: block;
    width: 100%;
    height: auto;
    object-fit: cover;

}

section {
    margin-bottom: 50px;
}

.contact {
    background-color: #f5f5f5;
    padding: 20px;
    margin-bottom: 50px;
    border-radius: 5px;
    display: flex;
    flex-direction: column;
    align-items: center;
}

.contact-text {
    margin-bottom: 20px;
    text-align: center;
}

.email-btn {
    padding: 10px 20px;
    background-color: #333;
    color: #fff;
    border: none;
    border-radius: 5px;
    cursor: pointer;
}

.big-img {
    display: block;
    width: 100%;
    height: 300px;
    background-color: green;
}

footer {
    background-color: #333;
    padding: 20px;
}

.footer-menu {
    display: flex;
    justify-content: center;
    list-style: none;
}

.footer-menu li {
    padding: 0 10px;
}

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

.footer-menu a:hover {
    text-decoration: underline;
}

@media screen and (max-width: 600px) {
    .footer-menu {
        display: block;
        text-align: center;
    }
    .footer-menu li {
        display: inline-block;
        padding: 5px;
    }
}