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background-size:100% auto;

You can try not to set a background image, but use the img tag to display the background image.

<p class="page">
    <img class="bg"/>
    <p class="page_Con">
    </p>
</p>

.page{position:relative;height: 100%;overflow:auto;}
.bg{width:100%;height:100%;}
.page_Con{position:absolute;top:0;left:0;width:100%;height:100%;}

background-size: cover; you need to set width in body and HTML first

You want to fully display the image without stretching it. If you are really obsessed with this, please provide a reference plan for the design:
After feathering the outline of the image, add a background color, and then get the color value of the background color of the image. Set css attributes in main_bg:

background-color: white;// 拿到的圖片背景色
background-image: url('鏈接');
background-size: 95%;  //可以寫成固定值
background-repeat: no-repeat;
background-position: center;