body {
    font-family: 'Trebuchet MS';
}

input[type="checkbox"]{
    display: none;
}

label {
    font-size: 17px;
    color: #00000070;
    display: inline-block;
    padding: 0 0 0 1em;
    cursor: pointer;
}
label:before {
    content: '';
    display: inline-block;
    background: #ffcc00;
    position: inherit;
    left: 0;
    top: 5px;
    height: 20px;
    width: 20px;
    margin-right: 10px;
    border-radius: 80%;
    box-shadow: 0px 1px 0 0 rgba(0, 0, 0, .2);
    box-sizing: border-box;
    border: 10px solid #fff;
    transition: border .3s ease;
}

input:checked + label:before {
    border-color: #fff;
    border-width: 3px;
}

input[type=checkbox]:checked + label:before {
    content: '\2713';
    color: #ffcc00;
    font-weight: bold;
    background: #f8f8f8;

}

input + label {
    transition: color .7s ease;
}
input:checked + label {
    color: #000000cf;
}

ul {
    list-style-type: none;
}