* {
    padding: 0;
    margin: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

.backarrow {
    background: white;
    position: relative;
    justify-content: start;
    margin-left: 40px;
    margin-top: 60px;
    border-radius: 30px;
    padding: 15px;
    transition: all 300ms ease-in-out;
}

.backarrow img {
    max-width: 60px;
    max-height: 60px;
}

.backarrow:hover {
    background: whitesmoke;
}

.welcome {
    color: #ffffff;
    text-align: center;
    margin-top: 3%;
}

iframe {
    border-radius: 17px;
}

.grayscale {
    background: white;
    padding: 40px 50px;
    border-radius: 17px;
    margin: 0px 25%;
}

.css-tnt {
    color: black;
    text-align: center;
}

.highlited-text {
    background-color: white;
    padding: 40px 50px;
    border-radius: 17px;
    margin: 20px 25%;
}

@media only screen and (-webkit-min-device-pixel-ratio: 2) {
    iframe {max-width: 500px;}
    p {font-size: 25px;}
    h4 {font-size: 35px;}
    h3 {font-size: 40px;}
    .highlited-text {min-width: 650px;}
    .grayscale {min-width: 650px;}
}