Acceptance Box Alignment Issues with text

Thanks

I modified the css code . I have used more specific element for each changes.

But I still have a problem, the acceptance checkbox is not on the same line than “I agree the given terms”

You are not going to be able to do that using <p> paragraph elements around your CF7 tags.
?
?I use Ordered List elements to display multiple fields on single line.

HTML:

<ol class="singleline">
<li> Phone: [text cf7-phone 15/]</li>
<li> Mobile: [text cf7-mobile 15/]</li>
</ol>

Added to Form section of CF7 interface.

CSS:

.wpcf7-form .singleline ol {
list-style: none;
margin: 0;
}

.wpcf7-form .singleline li{
display: inline-block;
float: left;
margin-right: 10px;
padding-right: 10px;
}

Add via Child Theme or use custom CSS plugin.