the image does not match the screen size of each device. In devices such as smartphones it is necessary to zoom-to adapt the image to the screen and in large devices such as tablets the image is surrounded by a white frame, being smaller than the screen.
The image is as shown in these photos on devices of different sizes:
This is the meta tag:
<meta content="width=device-width; initial-scale=1.0; maximum-scale=2.0; user-scalable=no;" name="viewport" /> <img src="url de la imagen" width="720" />
Thank you.
Update
With the help of @Guz now the image looks full, but still does not fit the screen, despite giving it 100% width.
Updated code:
<title></title>
<meta content="text/html; charset=UTF-8" http-equiv="Content-Type" />
<meta content="width=device-width; initial-scale=1.0; maximum-scale=2.0; user-scalable=1;" name="viewport" />
<style type="text/css">
html {
background-color: transparent;
height: 100%;
width:100%;
}
body {
background-color: transparent;
font-size: 11pt;
font-family:helvetica;
}
img {
border: 0;
display: block;
margin: 20px auto;
max-width: 100%;
}
</style>
<img src=" https://dl.dropboxusercontent.com/s/uvk4w2uq6tuhsb4/dosisacenoalto.PNG?dl=0" />