style.css

@import url('https://fonts.googleapis.com/css2?family=Big+Shoulders+Display:wght@700&family=Lexend+Deca&display=swap');

:root{
    /*Colors*/
    --firstBoxColor: hsl(31, 77%, 52%);
    --secondBoxColor: hsl(184, 100%, 22%);
    --thirdBoxColor: hsl(179, 100%, 13%);
    --paragraphsColor: hsl(0, 0%, 100%, 0.75);
    --lightColor: hsl(0, 0%, 95%);
    /*Dark Mode*/
    --darkColor: hsl(45, 8%, 10%);
    --darkCardColor: hsl(250, 5%, 25%);

    /*Fonts*/
    --lexendDecaFont: 'Lexend Deca', sans-serif;
    --bigShouldersDisplay: 'Big Shoulders Display', cursive;
}

body{
    background-color:  var(--lightColor);
    min-height: 50vh;
    display: flex;
    flex-direction: column;
    align-items: center;
    font-size: 15px;
    font-family: 'Lexend Deca', sans-serif;
    font-weight: 400;
    transition: all 0.4s ease;
}

.container{
    max-width: 960px;
    margin: 0 auto;
}

.grid-container{
    display: grid;
    grid-template-columns: 1fr 1fr 1fr;
    overflow: hidden;
    margin: 2rem;
    border-radius: 12px;
}

.icon-container{
    display: flex;
    justify-content: flex-end;
    align-items: center;
    height: 50px;
}

.icon{
    cursor: pointer;
    font-size: 25px;
    transition: all 0.6s ease;
}

/*------Main Box Styles------*/
.box{
    padding: 40px;
}

.box h2{
    font-family: 'Big Shoulders Display', cursive;
    text-transform: uppercase;
    color: var(--lightColor);
}

.box p{
    color: var(--paragraphsColor);
    line-height: 1.6;
}

.box a{
    background-color: var(--lightColor);
    padding: 10px 20px;
    text-decoration: none;
    border-radius: 20px;
    display: inline-block;
    margin-top: 50px;
    transition: all 300ms ease;
}
.box a:hover{
    border: 1px solid var(--lightColor);
    color: var(--lightColor);
    background-color: transparent;
    transition: all 300ms ease;
}


/*------BOX1 styles------*/
.box1{
    background-color: var(--firstBoxColor);
}
.box1 a{
    color: var(--firstBoxColor);
}


/*------BOX2 styles------*/
.box2{
    background-color: var(--secondBoxColor);
}
.box2 a{
    color: var(--secondBoxColor);
}


/*------BOX3 styles------*/
.box3{
    background-color: var(--thirdBoxColor);
}
.box3 a{
    color: var(--thirdBoxColor);
}

/*------Dark Mode------*/
.dark-mode{
    background-color: var(--darkColor);
    transition: all 0.4s ease;
}

.card-dark-mode{
    background-color: var(--darkCardColor);
    transition: all 0.6s ease;
}

.box1 .btn-dark-mode{
    color: var(--lightColor);
    background-color: var(--firstBoxColor
    );
}

.box2 .btn-dark-mode{
    color: var(--lightColor);
    background-color: var(--secondBoxColor);
}

.box3 .btn-dark-mode{
    color: var(--lightColor);
    background-color: var(--thirdBoxColor);
}

.icon-darkmode{
    color: var(--lightColor);
}

/*------Media Query------*/
@media only screen and (max-width: 768px){
    .grid-container{
        grid-template-columns: 1fr;
    }

    .box {
        border-bottom: 1px solid var(--darkColor);
    }
}