Thực hành BEM vào project website Landing Page

<header class="header"></header>
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<header class="header">
        <div class="header__logo-box">
            <img src="./img/logooutline.png" class="header__logo" alt="logo">          
        </div>
        <div class="header__text-box">
            <h3 class="heading-primary">
                <span class="heading-primary__main">
                    selftaught
                </span>
                <span class="heading-primary__sub">
                    is how you survive
                </span>
            </h3>
            <a href="#" class="btn btn-white btn-animated">See our courses</a>
        </div>
</header>
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<h3 class="heading-primary">
    <span class="heading-primary--main">
                    selftaught
    </span>
    <span class="heading-primary--sub">
     is how you survive
    </span>
 </h3>
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<a href="#" class="btn btn--white btn--animated">See our courses</a>
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*,
*::before,
*::after{
    margin: 0;
    padding: 0;
    box-sizing: inherit;
}

html{
    font-size: 62.5%;
}

body {
    font-family: "Lato", sans-serif;
    font-weight: 400;
    font-size: 1.6rem;
    line-height: 1.7;
    color: #777777;
    padding: 3rem;
    box-sizing: border-box;
}

.header{
    background-image: 
    linear-gradient(to right bottom, rgba(142, 158, 252, .8),rgba(28, 62, 255, .8)),
    url('../img/background1.jpg');
    background-size: cover;
    background-
    
    height: 95vh;
}

.header{
    -webkit-clip-path: ellipse(60% 60% at 50% 33%);
    clip-path: ellipse(60% 60% at 50% 33%);
}

.header__text-box{
    
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    text-align: center;
}

.header__logo{
    height: 7rem;
} 

.header__logo-box{
    
    top: 3rem;
    left: 3rem;
} 

.heading-primary{
    color: #fff;
    text-transform: uppercase;
    margin-bottom: 6rem;
}

.heading-primary--main{
    display: block;
    font-size: 6.2rem;
    font-weight: 400;
    letter-spacing: 1.5rem;
}

.heading-primary--sub{
    display: block;
    font-size: 2rem;
    font-weight: 700;
    letter-spacing: 1.8rem;
}

.btn,
.btn:link,
.btn:visited{
    text-transform: uppercase;
    text-decoration: none;
    padding: 1.5rem 4rem;
    display: inline-block;
    border-radius: 10rem;
    font-size: 1.6rem;
    
    transition: all .2s;
}

.btn::after {
    content: "";
    display: inline-block;
    height: 100%;
    width: 100%;
    
    top: 0;
    left: 0;
    z-index: -1;
    border-radius: 10rem;
    transition: all .4s;
}

.btn:hover{
    transform: translateY(-.3rem);
    box-shadow: 0 .5rem 2rem rgba(0, 0, 0, .2);
}

.btn:active{
    outline: none;
    transform: translateY(-.1rem);
    box-shadow: 0 .5rem 1rem rgba(0, 0, 0, .2);
}
.btn--white{
    color: #777777;
    background-color: #fff;
}

.btn--white::after{
    background-color: #fff;
}

.btn:hover::after{
    transform: scaleX(1.4) scaleY(1.6);
    opacity: 0;
}

.heading-primary--main{
    animation: moveInLeft 1s ease-out;
}

.heading-primary--sub{
    animation: moveInRight 1s ease-out
}

.btn--animated{
    animation: moveInBottom .5s ease-out .75s;
    animation-fill-mode: backwards;
}

@keyframes moveInLeft {
    0% {
        opacity: 0;
        transform: translateX(-10rem);
    }

    80% {
        transform: translateX(1rem)
    }

    100% {
        opacity: 1;
        transform: translateX(0);
    }
}

@keyframes moveInRight {
    0% {
        opacity: 0;
        transform: translateX(10rem);
    }

    80% {
        transform: translateX(-1rem)
    }

    100% {
        opacity: 1;
        transform: translateX(0);
    }
}

@keyframes moveInBottom {
    0% {
        opacity: 0;
        transform: translateY(3rem);
    }

    100% {
        opacity: 1;
        transform: translateY(0);
    }
}
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