main.css

body {
    margin: 0;
    height: 100vh;
}

.wrapper {
    color: #a2a2a2;
    font-family: 'Source Sans Pro', sans-serif;
    font-size: 1.4em;
    font-weight: 400;
    line-height: 1.75em;
    box-sizing: border-box;
    display: flex;
    background-color: whitesmoke;
}

@media screen and (max-width: 55em) {
    body {
        min-width: 100vw;
    }

    .wrapper {
        width: 100%;
        flex-direction: column;
    }

    #header {
        width: 100%;
        min-height: 10%;
        position: static;
        border-radius: 0 0 6px 6px;
        /* position: sticky; */
    }

    .image img {
        width: 25%;
    }

    .header .navbar, figcaption {
        font-size: 0.7em;
        flex-direction: row;
        gap: 10px;
        flex-wrap: wrap;
    }
    
   .navbar a {
        border-bottom: none;
        transition: transform .1s;
    }

    .navbar a:hover {
        transform: scale(1.05);
    }

    .navbar a:active {
        color: #05c58f;
    }

    #main {
        margin-left: 0;
        font-size: 0.7em;
        box-sizing: border-box;
    }

    .img {
        width: 75%;
        height: 80%;
    }

    .project .view::after {
        opacity: 1;
    }
}

.header {
    background-image: url("img/background.jpg");
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    min-height: 100vh;
    width: 25%;
    position: fixed;
    color: rgba(255, 255, 255, 0.5);
    border-radius: 0 6px 6px 0;
}

.inner {
    text-align: center;
}

[alt="Author image"] {
    width: 70%;
    border-radius: 100%;
    border: 1px gray solid;
}

.navbar, .navbar_contact {
    display: flex;
    flex-direction: column;
}

.navbar a:hover {
    border-bottom-color: transparent;
}

.navbar a:active {
    transform: scale(0.95);
}

.special {
    color: #31f5bc;
    border-bottom: dotted 1px;
    text-decoration: none;
    min-height: 35px;
    transition: transform .2s;
}

.navbar_contact .special {
    border-bottom: none;
}

#contact {
    text-align: center;
    padding: 60px 0;
}

.icon::before {
    padding-right: 5px;
}

.main {
    margin-left: 25%;
    padding: 0 40px;
    text-align: justify;
}

#main > section:first-child {
    margin: 4em 0 0 0;
}

#main > section:first-child ~ section {
    border-top: solid 2px #efefef;
    margin: 4em 0 0 0;
    padding: 4em 0 0 0;
}

#main > section:last-child {
    text-align: center;
    margin-bottom: 10px;
}

.btn_wrapper {
    text-align: right;
    height: 20px;
}

.hide {
    display: none;
}

.upBtn {
    cursor: pointer;
    border: solid 1px gray;
    border-radius: 2px;
    box-shadow: 0px 0px 2px 2px rgba(0, 0, 0, 0.2);
    transition: all .3s;
}

.upBtn:hover {
    border: 1px solid #31f5bc;
    color: #31f5bc;
    font-weight: bolder;
    box-shadow: none;
}

.upBtn:active {
    background-color: #23b38a;
}

.project_wrapper {
    display: flex;
    flex-wrap: wrap;
    justify-content: space-evenly
}

.project {
    text-align: center;
}

.project .special {
    border-bottom: none;
    text-decoration: underline;
}

.project figure > figcaption {
    font-size: .7em;
    font-style: italic;
}

.img {
    border-radius: 8px;
}

.view {
    position: relative;
}

.view::after {
    border: solid 3px gray;
    content: 'View';
    color: #23b38a;
    position: absolute;
    bottom: 50%;
    right: 50%;
    transform: translate(50%, 50%);
    opacity: 0;
    border-radius: 8px;
    font-weight: bold;
    padding: 0 10px;
    transition: opacity .2s ease-in-out;
}

.view:hover {
    opacity: 0.9;
}

.view:hover::after {
    opacity: 1;
}