*{
    margin: 0px;
    padding: 0px;
    box-sizing: border-box;
    font-family: system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, 'Open Sans', 'Helvetica Neue', sans-serif;
}
body{
    background-color: #f2f2f2;
}

.heading{
    width: 90%;
    display: flex;
    justify-content: center;
    align-items: center;
    flex-direction: column;
    text-align: center;
    margin: 20px auto;
}
.heading h1{
    font-size: 50px;
    color: #000;
    margin-bottom: 25px;
    position: relative;
}
.heading h1::after{
    content: "";
    position: absolute;
    width: 100%;
    height: 4px;
    display: block;
    margin: 0 auto;
    background-color: #4caf50;

}

.gallery{
    margin: 60px;
}
.gallery video{
    
    padding: 5px;
    filter: grayscale(80%);
    transition: 1s;
}
.gallery video:hover{
    filter: grayscale(0%);
    transform: scale(1.1);
}
.gallery img{
    width: 350px;
    padding: 5px;
    filter: grayscale(80%);
    transition: 1s;
}

.gallery img:hover{
    filter: grayscale(0%);
    transform: scale(1.1);
}
@media(max-width: 700px){
    .gallery img{
        width: 100px;
        
    }
    
    .gallery video{
        width: 150px;
    }

}