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width: 2000px;
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position: fixed;
right:50px;
bottom:100px;
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<div id="gotop" class="top">
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<p>天王盖地虎，小鸡炖蘑菇</p>
<p>天王盖地虎，小鸡炖蘑菇</p>
<p>天王盖地虎，小鸡炖蘑菇</p>
<p>天王盖地虎，小鸡炖蘑菇</p>
<p>天王盖地虎，小鸡炖蘑菇</p>
<p>天王盖地虎，小鸡炖蘑菇</p>
<p>天王盖地虎，小鸡炖蘑菇</p>
<p>天王盖地虎，小鸡炖蘑菇</p>
<p>天王盖地虎，小鸡炖蘑菇</p>
<p>天王盖地虎，小鸡炖蘑菇</p>
<p>天王盖地虎，小鸡炖蘑菇</p>
<p>天王盖地虎，小鸡炖蘑菇</p>
<p>天王盖地虎，小鸡炖蘑菇</p>
<p>天王盖地虎，小鸡炖蘑菇</p>
<p>天王盖地虎，小鸡炖蘑菇</p>
<p>天王盖地虎，小鸡炖蘑菇</p>
<p>天王盖地虎，小鸡炖蘑菇</p>
<p>天王盖地虎，小鸡炖蘑菇</p>
<p>天王盖地虎，小鸡炖蘑菇</p>
<p>天王盖地虎，小鸡炖蘑菇</p>
<p>天王盖地虎，小鸡炖蘑菇</p>
<p>天王盖地虎，小鸡炖蘑菇</p>
<p>天王盖地虎，小鸡炖蘑菇</p>
<p>天王盖地虎，小鸡炖蘑菇</p>
<p>天王盖地虎，小鸡炖蘑菇</p>
<p>天王盖地虎，小鸡炖蘑菇</p>
<p>天王盖地虎，小鸡炖蘑菇</p>
<p>天王盖地虎，小鸡炖蘑菇</p>
<p>天王盖地虎，小鸡炖蘑菇</p>
<p>天王盖地虎，小鸡炖蘑菇</p>
<p>天王盖地虎，小鸡炖蘑菇</p>
<p>天王盖地虎，小鸡炖蘑菇</p>
<p>天王盖地虎，小鸡炖蘑菇</p>
<p>天王盖地虎，小鸡炖蘑菇</p>
<p>天王盖地虎，小鸡炖蘑菇</p>
<p>天王盖地虎，小鸡炖蘑菇</p>
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️我还很喜欢你、就像sin²x+cos²x始终如一
