style.css

* {
    margin:0;
    padding: 0;
    box-sizing: border-box;
    font-family: "spartan", sans-serif;
}

h1 {
    font-size: 50px;
    line-height: 64px;
    color: black;
}

h2 {
    font-size: 46px;
    line-height: 54px;
    color: black;
}

h4 {
    font-size: 26px;
    color: black;
}

h6 {
    font-weight: 700;
    font-size: 12px;
}

p {
    font-size: 16px;
    color: #465b52;
    margin: 15px 0 20px 0;
}

.section-p1 {
    padding: 40px 80px;
}

.section-n1 {
    margin: 40px 0;
}

body {
    width:100%;
}

#header {
    display: flex;
    align-items:center;
    justify-content: space-between;
    padding: 20px 80px;
    background-color: #e3e6f3;
    box-shadow: 0px 5px 15px rgb(0, 0, 0, 0.06);
}

#nav{
    display: flex;
    align-items: center;
    justify-content: center;
}

#nav li{
    list-style: none;
    padding: 0px 20px;
    position: relative;
}

#nav li a {
    text-decoration: none;
    font-size: 16px;
    font-weight: 600;
    color: #1a1a1a;
    transition: 0.3s ease;
}

#nav li a:hover ,
#nav li a.active {
    color: #088178;
}

#nav li a.active::after, 
#nav li a:hover::after {
    content: "";
    width: 30%;
    height: 2px;
    background-color: #088178;
    position: absolute;
    bottom: -4px;
    left: 20px;
}