/* When the checkbox11 is checked, add a blue background */
.container input:checked ~ .checkmark11 {
background-color: #f0f0f0;
border: 2px solid #343434;
}
/* Create the checkmark11/indicator (hidden when not checked) */
.checkmark11:after {
content: "";
position: absolute;
display: none;
filter: drop-shadow(0 0 10px #888);
}
/* Show the checkmark11 when checked */
.container input:checked ~ .checkmark11:after {
display: block;
}