index.css

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

body {
    background-color: rgb(108, 108, 109);
}

header {
    font-family: sans-serif;
    width: 100%;
    height: 100vh;
}

nav {
    width: 100%;
    height: 100px;
    display: flex;
    justify-content: space-around;
    align-items: center;
}

.logo {
    font-size: 2em;
    letter-spacing: 2px;
}

.menu a {
    text-decoration: none;
    color: black;
    padding: 10px 20px;
    font-size: 20px;
    position: relative;
}

.menu a:before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 0%;
    height: 100%;
    border-top: 2px solid black;
    z-index: 1;
    transition: 0.4s linear;
}

.menu a:hover:before {
    width: 90%;
}

.login a {
    text-decoration: none;
    color: white;
    background: black;
    padding: 10px 20px;
    border-radius: 8px;
    transition: 0.4s;
}

.login a:hover {
    background: transparent;
    border: 1px solid black;
    color: black;
}

#h-text {
    width: 100%;
    height: 70%;
    display: flex;
    justify-content: space-around;
    align-items: center;
}

#h-text h1 {
    font-size: 3em;
}

#h-text span {
    color: skyblue;
}

#h-text a {
    text-decoration: none;
    background: black;
    color: white;
    letter-spacing: 5px;
    padding: 10px 20px;
    position: relative;
    z-index: 1;
}

#h-text a:before {
    content: '';
    position: absolute;
    top: 10px;
    left: 10px;
    width: 100%;
    height: 100%;
    border: 1px solid black;
    background: skyblue;
    z-index: -1;
}

#man {
    position: absolute;
    bottom: 0;
    left: 350px;
    height: 50%;
}

#himg {
    box-shadow: 20px 10px 8px rgb(59, 59, 59);
    border-radius: 13px;
    height: 400px;
    width: 100%;
    opacity: 92%;
}