style.css

@import url(https://fonts.google.com/specimen/Lexend+Deca);
@import url(https://fonts.google.com/specimen/Big+Shoulders+Display);
*{
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body{
    background-color: hsl(0, 0%, 95%);
}

nav{
    display: flex;
    padding: 2% 0%;
    justify-content: space-between;
    align-items: center;
}

.nav-links{
    flex: 1;
    text-align: right;
}

.nav-links ul li{
    list-style: none;
    display:inline-block;
    padding: 8px 12px;
    position: relative;

}

.nav-links ul li a{
    color: rgb(226, 37, 78);
    text-decoration: none;
    font-size: 15px;
}

.nav-links ul li::after{
    content: '';
    width: 0%;
    height: 2px;
    background: #f44336;
    display: block;
    margin: auto;
    transition: 0.5s;
}

.nav-links ul li:hover::after{
    width: 100%;
}

main{
    width: 50%;
    margin: auto;
    display: flex;
    justify-content: center;
    height:100vh ;
    flex-direction: column;
}

.firstbox{
    background-color: hsl(31, 77%, 52%);
    padding: 2em;
    width: 50%;
}

.firstbox h2{
    color: hsl(0, 0%, 95%);
    padding-bottom: 5px;
    padding-top: 70px;
    font-weight: 700;
    font-family:Big Shoulders Display ;
}

.firstbox p{
    color:hsla(0, 0%, 100%, 0.75);
    font-size: 15px;
    font-weight: 400;
    font-family:Lexend Deca ;
   
}

.firstbox button{
    margin-top: 100px;
    margin-bottom: 10px;
    background-color:hsl(0, 0%, 95%); 
    font-size: 13px;
    padding:10px 30px 10px 30px ;
    border-radius: 500px;
    border: 2px solid hsl(0, 0%, 95%);
    color: hsl(31, 77%, 52%);
}

.sedan{
    padding-top: 30px;
}

.secondbox{
    background-color:  hsl(184, 100%, 22%) ;
    padding: 2em;
    width: 50%;
}

.secondbox h2{
    color: hsl(0, 0%, 95%);
    padding-bottom: 5px;
    padding-top: 70px;
    font-weight: 700;
    font-family:Big Shoulders Display ;
}

.secondbox p{
    color:hsla(0, 0%, 100%, 0.75);
    font-size: 15px;
    font-weight: 400;
    font-family:Lexend Deca ;
}

.secondbox button{
    margin-top: 100px;
    margin-bottom: 10px;
    background-color:hsl(0, 0%, 95%); 
    font-size: 13px;
    padding:10px 30px 10px 30px ;
    border-radius: 500px;
    border: 2px solid hsl(0, 0%, 95%);
    color: hsl(184, 100%, 22%);
}

.suv{
    padding-top: 30px;
}

.thirdbox{
    background-color:hsl(179, 100%, 13%) ;
    padding: 2em;
    width: 50%;
}

.thirdbox h2{
    color: hsl(0, 0%, 95%);
    padding-bottom: 5px;
    padding-top: 70px;
    font-weight: 700;
    font-family:Big Shoulders Display ;
}

.thirdbox p{
    color:hsla(0, 0%, 100%, 0.75);
    font-size: 15px;
    font-weight: 400;
    font-family:Lexend Deca ;
}

.thirdbox button{
    margin-top: 100px;
    margin-bottom: 10px;
    background-color:hsl(0, 0%, 95%); 
    font-size: 13px;
    padding:10px 30px 10px 30px ;
    border-radius: 500px;
    border: 2px solid hsl(0, 0%, 95%);
    color:hsl(179, 100%, 13%) ;
}

.luxury{
    padding-top: 30px;
}

.mainbox{
    display: flex;
}

@media (max-width: 375px){
    #mainbox{
    display: flex;
    flex-direction: column;
    }
}