element.style {
    width: 100%;
    display: none;
}
img.mySlides {
}
<style>
.mySlides {
    display: none;
}
img {
    vertical-align: middle;
}
img {
    border-style: none;
}
*, *:before, *:after {
    box-sizing: inherit;
}
html, body {
    font-family: Verdana,sans-serif;
    font-size: 15px;
    line-height: 1.5;
}
html {
    -ms-text-size-adjust: 100%;
    -webkit-text-size-adjust: 100%;
}
user agent stylesheet
html {
    color: -internal-root-color;
}
*, *:before, *:after {
    box-sizing: inherit;
}
*, *:before, *:after {
    box-sizing: inherit;
}