style.css

body {
    margin: 0;
    padding: 0;
    background-color: #162F3E;
    color: white;
    font-family: 'Raleway', sans-serif;
}

h1 {
    margin: 0;
    padding: 0;
}

img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.title {
    display: flex;
    justify-content: center;
    margin-top: 2%;
}

.wrapper {
    display: flex;
    justify-content: center;
}

.content {
    display: flex;
    margin-top: 4%;
    justify-content: space-around;
    position: relative;
    padding: 0 20px;
    width: 900px;
    height: 648px;
}

.navigation {
    display: block;
    width: 30%;
    flex: 1;
}

#nav__wrapper {
    display: flex;
    flex-direction: column;

}

.main {
    padding: 10px;
    background-color: #fff;
    width: 56%;
}

.btn {
    height: 3em;
    font-size: 18px;
    color: #73828b;
    background-color: #132a37;
    border: 1px solid #112531;
}

.btn:hover {
    color: #d0d5d8;
    cursor: pointer;
}

.btn:focus {
    color: #fff;
    outline: 0;
    background-color: #1d3d51;
}

.menu {
    position: absolute;
    top: 30px;
    padding-left: 6%;
}

.hamburger {
    display: none;
    background: url("./img/menu.png") no-repeat center;
    height: 20px;
    width: 20px;
    position: absolute;
    top: -5px;
    border: none;
}

input[type="checkbox"]:checked ~ .main {
    background-color: orangered;
    margin: 10px;
    padding: 10px;
}

@media screen and (max-width: 700px) {
    .hamburger {
        display: block;
    }

    .title {
        font-size: 26px;
    }

    .main {
        width: 90%;
    }

    .navigation {
        display: none;
        width: 60%;
        left: 0;
        position: absolute;
    }

    .hamburger--open {
        background: url("./img/x.png") no-repeat center;
    }

    .navigation--open {
        display: block;
    }
}