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

input[type="checkbox"]+label {
    display: block;
    position: relative;
    padding-left: 35px;
    margin-bottom: 20px;
    font-weight: 600;
    color: #141414;
    cursor: pointer;
    -webkit-user-select: none;
    -moz-user-select: none;
    -ms-user-select: none;
}

input[type="checkbox"]+label:last-child {
    margin: 9px;
    line-height: 2.2;
}

input[type="checkbox"]+label:before {
    content: '';
    display: block;
    width: 20px;
    height: 20px;
    border: 3px solid #147e2b;
    position: absolute;
    left: 5px;
    opacity: .6;
    -webkit-transition: all .12s, border-color .08s;
    transition: all .12s, border-color .08s;
}

input[type="checkbox"]:checked+label:before {
    width: 10px;
    top: 3px;
    left: 9px;
    border-radius: 0;
    opacity: 1;
    border-top-color: transparent;
    border-left-color: transparent;
    -webkit-transform: rotate(45deg);
    transform: rotate(45deg);
}

input {
    margin: 0.4rem;
}

.em_link {
    color: #1186b4;
    font-weight: 600;
    border-bottom: 1px solid #1186b4;
    width: 260px;
}

#toc3 ul {
    display: flex;
}

#toc3 .postimage {
    margin: 10px auto;
    text-align: center;
    width: 80%;
}