index.css

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

body {
    overflow: hidden;
}
a:link,
a:visited {
    text-decoration: none;
    color: black;
}

.container {
    width: 50%;
    margin: 0 auto;
    position: relative;
    min-width: 460px;
}

.textInfo {
    width: 100%;
    text-align: center;
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
}
.textInfo > h1 {
    font-size: 50px;
}

.textInfo > p {
    font-size: 24px;
}

img {
    width: 100%;
    height: 87vh;
    opacity: 0.5;
    vertical-align: middle;

}
.img-wrap {
    border-width: 4px 4px 0 4px;
    border-style: solid;
}

nav > div.container {
    width: 100%;
    height: 10vh;
    margin-bottom: 4px;
}

.nav-wrap {
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 70%;
    background-color: skyblue;

    padding: 8px;

    border-width: 4px;
    border-style: solid;
}
.nav-menu > span {
    margin-right: 8px;
    font-size: 16px;
    font-weight: bold;
}
.nav-menu > span:last-child {
    margin-right: 0;
}

.footer-wrap > p {
    text-align: center;
    font-size: 4px;
    font-weight: bold;
}
.img-wrap > p {
    text-align: center;
    font-size: 4px;
    font-weight: bold;
}