When I click checkbox not show mark as selected and vice verse - html

Question

I do some code for checkbox to style it. But checkbox mark doesn't hide as default. I expect, mark should hidden as default and when I click to select it, then there should be show a mark as selected this label. Please help me to solve this problem. Thanks in advance for your help.
.checkbox {
width: 38px;
height: 38px;
margin: 10px;
// border: 1px solid #000;
background: #A53692; /*blue purple*/
}
.label {
position: relative;
width: 645px;
margin: 10px;
padding-left: 20px;
line-height: 38px;
text-align: left;
color: #fff;
background: #A53692; /*blue purple*/
cursor: pointer;
}
.checkbox input[type=checkbox] {
content: "";
width: 38px;
height: 38px;
margin: 0;
left: 0;
opacity: 0;
cursor: pointer;
}
.label label::after {
content: "";
height: 6px;
width: 9px;
border-left: 2px solid;
border-bottom: 2px solid;
transform: rotate(-45deg);
position: absolute;
left: -45px;
top: 14px;
cursor: pointer;
}
/*Hide the checkmark by default*/
.checkbox input[type="checkbox"] + .label label::after {
content: none;
}
/*Unhide the checkmark on the checked state*/
.checkbox input[type="checkbox"]:checked + .label label::after {
content: "";
<div class="request-sample-form-items">
<div class="checkbox"><input type="checkbox" id="checkbox"></div>
<div class="label"><label for="checkbox">Select if you want to fill this form automatically next time.</label></div>
</div>

Answer 1

Try this
/* The label-check */
.label-check {
display: block;
position: relative;
padding-left: 35px;
margin-bottom: 12px;
cursor: pointer;
font-size: 22px;
-webkit-user-select: none;
-moz-user-select: none;
-ms-user-select: none;
user-select: none;
}
/* Hide the browser's default checkbox */
.label-check input {
position: absolute;
opacity: 0;
cursor: pointer;
height: 0;
width: 0;
}
/* Create a custom checkbox */
.checkmark {
position: absolute;
top: 0;
left: 0;
height: 25px;
width: 25px;
background-color: #A53692;
}
/* On mouse-over, add a background color */
.label-check:hover input ~ .checkmark {
background-color: #A53692;
}
/* When the checkbox is checked, add a background */
.label-check input:checked ~ .checkmark {
background-color: #A53692;
}
/* Create the checkmark/indicator (hidden when not checked) */
.checkmark:after {
content: "";
position: absolute;
display: none;
}
/* Show the checkmark when checked */
.label-check input:checked ~ .checkmark:after {
display: block;
}
/* Style the checkmark/indicator */
.label-check .checkmark:after {
left: 9px;
top: 5px;
width: 5px;
height: 10px;
border: solid white;
border-width: 0 3px 3px 0;
-webkit-transform: rotate(45deg);
-ms-transform: rotate(45deg);
transform: rotate(45deg);
}
<label class="label-check">Checkbox One
<input type="checkbox" checked="checked">
<span class="checkmark"></span>
</label>

Answer 2

try to remove opacity from the following CSS
.checkbox input[type=checkbox] {
content: "";
width: 38px;
height: 38px;
margin: 0;
left: 0;
opacity: 0; //REMOVE
cursor: pointer;
}