Multiple Checkboxes, Only One Is Selectable - html

Question

So I have these checkboxes on a page, but no matter which one I click on, only the first one gets the check mark. I have no idea what the problem is. At first I was having the problem that the checkbox wouldn't show up as checked, but now it's just the first one that is getting selected. There is a button on the page that selects all the boxes, and that works, it is just when a user tries to select one that it does't work.
Code
.checkbox {
margin: 3px auto;
width: 25px;
position: relative;
}
.checklabel {
cursor: pointer;
position: absolute;
width: 25px;
height: 25px;
top: 0;
left: 0;
background: #eee;
border:1px solid #ddd;
}
.checkbox .checklabel:after {
opacity: 0.2;
content: '';
position: absolute;
width: 9px;
height: 5px;
background: transparent;
top: 6px;
left: 7px;
border: 3px solid #333;
border-top: none;
border-right: none;
transform: rotate(-45deg);
}
.checklabel:hover::after {
opacity: .5;
}
.checkbox input[type=checkbox]:checked + .checklabel:after {
opacity: 1;
}
<td><div class="checkbox"><input class="check" id="check" type="checkbox"><label class="checklabel" for="check"></label></div></td>
<td><div class="checkbox"><input class="check" id="check" type="checkbox"><label class="checklabel" for="check"></label></div></td>

Answer 1

An id may only be used once per page, and the for attribute of your label needs to reference the unique id for the input you want it to control.
.checkbox {
margin: 3px auto;
width: 25px;
position: relative;
}
.checklabel {
cursor: pointer;
position: absolute;
width: 25px;
height: 25px;
top: 0;
left: 0;
background: #eee;
border: 1px solid #ddd;
}
.checkbox .checklabel:after {
opacity: 0.2;
content: '';
position: absolute;
width: 9px;
height: 5px;
background: transparent;
top: 6px;
left: 7px;
border: 3px solid #333;
border-top: none;
border-right: none;
transform: rotate(-45deg);
}
.checklabel:hover::after {
opacity: .5;
}
.checkbox input[type=checkbox]:checked + .checklabel:after {
opacity: 1;
}
<td>
<div class="checkbox"><input class="check" id="check" type="checkbox"><label class="checklabel" for="check"></label></div>
</td>
<td>
<div class="checkbox"><input class="check" id="check2" type="checkbox"><label class="checklabel" for="check2"></label></div>
</td>