.heart-checkbox {
    box-sizing: border-box;
    width: 50px;
    height: 50px;

    margin: 0;
    padding: 0;
    border: 0;
    outline: 0;

    background-color: white;
    cursor: pointer;
    box-shadow: 0 0 50px rgba(0, 0, 0, 0.3);

    transform: rotate(135deg);
    transition: all .3s;
}

.heart-checkbox::before {
    content: "";

    display: block;
    position: relative;
    right: 25px;

    width: 50px;
    height: 50px;

    margin: 0;
    padding: 0;
    outline: 0;
    border-radius: 50%;

    background-color: white;

    transition: all .3s;
}

.heart-checkbox::after {
    content: "";

    display: block;
    position: relative;
    bottom: 25px;

    width: 50px;
    height: 50px;

    margin: 0;
    padding: 0;
    outline: 0;
    border-radius: 50%;

    background-color: white;

    transition: all .3s;
}

.heart-checkbox.checked {
    background-color: pink;
}

.heart-checkbox.checked::before {
    background-color: pink;
}

.heart-checkbox.checked::after {
    background-color: pink;
}