/* When the checkbox is checked, add a blue background */
.container18 input:checked ~ .checkmark18 {
background-color: #47da99;
animation: pop 0.5s;
animation-direction: alternate;
}
/* Create the checkmark18/indicator (hidden when not checked) */
.checkmark18:after {
content: "";
position: absolute;
display: none;
}
/* Show the checkmark18 when checked */
.container18 input:checked ~ .checkmark18:after {
display: block;
}