style.css

@import url('https://fonts.googleapis.com/css2?family=Poppins:wght@400;700&display=swap');
* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

body {
    font-family: 'Poppins', sans-serif;
    font-size: 16px;
    line-height: 1.5; /*Spacing*/
    color: #333;
    background: #a1c3ff;
}

img {
    max-width: 100%;
}

h1, h2 {
    margin-bottom: 15px;
}

ul {
    list-style-type: none;
}

.container {
    max-width: 1100px;
    margin: 0 auto;
    padding: 0 30px;
}

.navbar {
    background: #3474e6;
    color: #fff;
    height: 60px;
}

.navbar .logo {
    font-size: x-large;
    font-weight: bold;
}

.navbar a {
    color: #fff;
    text-decoration: none;
    font-size: 18px;
    font-weight: bold;
}

.navbar a:hover {
    color:lightblue;
}

.navbar .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 100%; /*100% of navbar, must otherwist align-items will not work due to container no height*/
}

.navbar ul {
    display: flex;
}

.navbar ul li {
    margin-left: 20px;
}

.header {
    background-color: #0a51cc;
    color: white;
    min-height: 400px;
}

.header h1 {
    font-size: 3rem;
    font-weight: bold;
    line-height: 1.2;
}

.header img {
    max-width: 400px;
}

.header .container {
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.boxes .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.box {
    flex: 1;
    background: #0a51cc;
    color: white;
    border-radius: 10px;
    margin: 20px 10px;
    box-shadow: 0 3px 5px rgba(0,0,0,0.6);
    padding: 15px 20px;
}

.box i {
    margin-right: 10px
}

@media(max-width: 768px) {
    .header .container {
        flex-direction: column;
        padding-top: 20px;
        text-align: center;
    }

    .boxes .container {
        display: block;
        text-align: center;
    }
}