CSS不适用于div元素

Question

I have this problem with my css, I'm trying to make my X button appear to the top right corner of my the div frame. The problem is that it is just not appearing anywhere. the codes seems okay to me. I wonder what is causing this problem?. Can someone help? Please run the snippet you will see that the button x is not appearing at all!and I apologize for the unnecessary long html codes.

 .x { position: absolute; background: red; color: white; top: -10%; right: -10%; } 

 <div class="divider"></div> <div class="frame" onmouseover=""><button class="x">X</button><!--This button--> <div class="section"> <h5>Only take into consideration of the x button</h5> <center> <div class="uploader" onclick="selectFile(this)"></div><input type="file" name="userprofile_picture" accept="image/*" onchange="handleImage(this)" /></center> <div class="grid-container"> <div class="grid-item"> <p style="color:white">A) '+A+'</p> </div> <div class="grid-item"> <p style="color:white">B) '+C+'</p> </div> <div class="grid-item"> <p style="color:white">C) '+B+'</p> </div> <div class="grid-item"> <p style="color:white">D) '+D+'</p> </div> </div> <div class="grid-container3"> <div class="grid-item"><span style="color:green;font-weight:bold">Answer: '+answer+'</span></div> <div class="grid-item"></div> <div class="grid-item"></div> <div class="grid-item"><input class="timer" type="range" min="3" max="20" value="10" oninput="showValue(this)"> <h4> <p>5 Minutes</p> </h4> </div> </div> </div> </div><br> 

Answer 1

Your values are wrong. You're placing it on the top right corner and outside of the frame because of the negative values. Try this:

.x {
    position: absolute;
    background: red;
    color: white;
    top: 10%;
    right: 10%;
}

Answer 2

There is a problem with your positioning

The absolute position makes it to the top right-hand corner, from right to left. By making it -10% you are taking it off the screen. You could position it with a positive number

Without positioning