html {
    box-sizing: border-box;
    font-size: 62.5%;
}
*, *:before, *:after {
    box-sizing: inherit;
}
body {
    font-family: 'Rubik', sans-serif;
    font-size: 3.6rem;
    line-height: 2;
}
body::-webkit-scrollbar {
    width: 10px;
}
body::-webkit-scrollbar-track {
    background: #eee;
}
body::-webkit-scrollbar-thumb {
    background-color: blue;
    border-radius: 20px;
    border: 1px solid #eee;
}
.container {
    max-width: 1200px;
    width: 95%;
    margin: 0 auto;
}
h1 {
    font-family: 'Bai Jamjuree', sans-serif;
    font-size: 6rem;
}
.no-margin {
    margin: 0
}
.site-header a {
    color: blue;
    font-size: 1.8rem;
    text-decoration: none;
    font-weight: 500;
    letter-spacing: .1rem;
}
.site-header h1 {
    color: black;
    font-weight: 600;
    font-size: 3rem;
    line-height: 2.5rem;
    margin: 6rem 0;
    text-align: center;
}
.nav-bar {
    display: flex;
    justify-content: space-between;
    align-items: center;
}
.text-header {
    color: #555;
    text-align: left;
    margin: 5rem 0 5rem 0;
    max-width: 900px;
    letter-spacing: .2rem;
    line-height: 5rem;
}
@media (min-width: 768px) {
    .site-header h1 {
        text-align: left;
    }
    .text-header {
        margin: 8rem 0 5rem 0;
    }
}
.text-header p {
    font-size: 4rem;
}
.text-header span {
    color: blue;
    transition: .3s ease-in-out;
}
.text-header span:hover {
    color: black;
}
@media (min-width: 550px) {
    .text-header span:hover {
        font-size: 4rem;
        color: black;
    }
}
.main-content {
    display: flex;
    flex-wrap: wrap;
}
.main-expertise {
    margin: 5rem 0;
}
.expertise {
    font-weight: 500;
    color: blue;
    font-size: 6rem;
    line-height: 10rem;
    transition: .4s ease-in-out;
}
.expertise:hover {
    color: black;
    font-size: 8rem;
    line-height: 10rem;
    text-decoration: underline;
}
@media (min-width: 768px) {
    .main-content {
        justify-content: space-between;
    }
    .main-expertise {
    margin: 5rem 0;
    }
    .expertise {
        font-size: 10rem;
        line-height: 12rem;
    }
    .expertise:hover {
        color: black;
        font-size: 14rem;
        line-height: 22rem;
        text-decoration: underline;
    }
}
.site-footer {
    margin: 5rem 0;
    text-align: center;
}
.site-footer p {
    color: #555;
    font-size: 2rem;
    line-height: 2.2rem;
}
.site-footer a {
    font-size: 3.2rem;
    transition: .3s ease-in-out;

}
.site-footer a:hover {
    color: black;
}
.footer-container {
    display: grid;
}
.footer-container a {
    text-decoration: none;
}
@media (min-width: 768px) {
    .footer-container {
        display: flex;
        justify-content: space-between;
    }    
}