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

html {
    scroll-behavior: smooth;
}

body {font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, 'Open Sans', 'Helvetica Neue', sans-serif; width: 100%; height: 100vh;}

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

.backarrow img {
    max-width: 60px;
    max-height: 60px;
    margin-top: 30px;
}

.backarrow:hover {
    box-shadow: #fff 6px 6px 6px;
}

.boxes {
    display: flex;
    flex-direction: row;
    justify-content: center;
    margin-top: 50px;
    text-align: center;
    text-decoration: none;
}

.tips {
    margin-left: 60px;
    margin-top: 60px;
}

.tips a {
    text-decoration: none;
    color: #000000;
}

.css {
    background: #ffffff;
    padding: 40px;
    box-shadow: #000000 6px 6px 6px;
    border-radius: 4px;
    transition: all 300ms ease-in-out;
}

.css:hover, .css a:hover {
    background: whitesmoke;
    color: black;
}

.programs {
    background: #ffffff;
    padding: 40px;
    box-shadow: #000000 6px 6px 6px;
    border-radius: 4px;
}

.programs:hover, .programs a:hover {
    background: whitesmoke;
    color: black;
}

.win10 {
    background: #ffffff;
    padding: 40px;
    box-shadow: #000000 6px 6px 6px;
    border-radius: 4px;
}

.win10:hover, .win10 a:hover {
    background: whitesmoke;
    color: black;
}

.chrome-extensions {
    background: #ffffff;
    padding: 40px;
    box-shadow: #000000 6px 6px 6px;
    border-radius: 4px;
}

.chrome-extensions:hover, .chrome-extensions a:hover {
    background: whitesmoke;
    color: black;
}

@media only screen and (-webkit-min-device-pixel-ratio: 2) {
    .boxes {
        flex-direction: column;
        margin-left: 200px;
    }

    body {
        height: 150vh;
    }

    .css, .programs, .win10, .chrome-extensions {
        width: 450px;
        font-size: 25px;
    }
    .backarrow {
        min-width: 150px;
        min-height: auto;
    }
}