body {
    font-family: monospace;
    background-color: #F8F8F8;
}

main {
    width: 800px;
    display: inline-block;
    margin-left: calc((100% - 800px) / 2);
}

header {
    display: inline-block;
    width: 100%;
    margin-top: 20px;
}

header>img {
    float: left;
    height: 50px;
}

nav {
    float: right;
    margin-top: 7px;
}

a {
    /* display: inline-block; */
    text-decoration: none;
    color: #9E9E9E;
    font-size: 20px;
    line-height: 20px;
    padding: 5px 20px;
    float: left;
    border: 3px solid transparent;
    border-radius: 20px;
}
/* a+a {
    margin-left: 0px;
} */

a:last-child {
    border-color: #9E9E9E; 
    text-transform: uppercase; 
    margin-left: 20px;
}

a:hover {
    color: #84bf66;
    text-decoration: underline;
}

section {
    display: inline-block;
    width: 100%;
    margin-top: 30px;
}

div {
    display: inline-block;
    /* float: left; */
    width: 40%;
    color: #9E9E9E;
    margin-top: 35px;
    margin-left: 5%;
}

h1 {
    font-size: 80px;
    margin: 0px;
}

p {
    margin: 0px;
    font-size: 24px;
}

section>img {
    float: right;
    width: 40%;
    margin-right: 5%;
}

@media (max-width: 850px) {
    main {
        width: 600px;
        margin-left: calc(50% - 300px);
    }
    
    a {
        font-size: 15px;
        line-height: 15px;
        padding: 5px 15px;
    }
    section>img {
        margin-top: 40px;
    }
}

@media (max-width: 650px) {
    main {
        width: 400px;
        margin-left: calc(50% - 200px);
    }
    header > img {
        width: 100%;
        height: 50px;
        object-fit: contain;
        object-position: center;
    }
    nav {
        display: inline-block;
        width: 100%;
    }
    a {
        padding: 5px 7px;
    }
    section {
        margin-top: 0;
    }
    section > img {
        margin-top: 80px;
    }
}

@media (max-width: 450px) {
    main {
        width: 300px;
        margin-left: calc(50% - 150px);
    }
    
    header {
        float: left;
        width: 40%;
    }

    header > img {
        object-position: left;
    }

    nav {
        margin-top: 60px;
    }

    a:last-child {
        margin-left: 0px;
    }

    section {
        float: left;
        width: 55%;
        margin-top: 45px;
    }

    div {
        display: inline-block;
        width: 100%;
    }

    section > img {
        display: inline-block;
        margin-top: 80px;
        width: 150%;
    }
}