.menu-fundo {
    position: fixed;
    top: 0;
    left: 0;
    z-index: 2;
}

.caixa {
    position: absolute;
    top: 0.5rem;
    left: 0.5rem;
    width: 60px;
    height: 60px;
    border-radius: 50%;
    opacity: 0;
    z-index: 3;
    cursor: pointer;
}

.itens {
    position: absolute;
    top: 0.5rem;
    left: 0.5rem;
    width: 60px;
    height: 60px;
    border-radius: 50%;
    background-color: #111;
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 2;
}

.itens>div {
    position: absolute;
    width: 50%;
    height: 3px;
    border-radius: 1.5px;
    background-color: #fff44f;

}

.itens>div:before,
.itens>div:after {
    content: '';
    position: absolute;
    width: 100%;
    height: 3px;
    border-radius: 1.5px;
    background-color: #fff44f;

}

.itens>div::before {
    top: -10px;
}

.itens>div::after {
    top: 10px
}

.caixa:checked+.itens>div {
    transform: rotate(135deg);
}

.caixa:checked:hover+.itens>div {
    transform: rotate(255deg);
}

.caixa:checked+.itens>div::after,
.caixa:checked+.itens>div::before {
    transform: rotate(90deg);
    top: 0;
}

.caixa:checked ~ .menu{
    visibility: visible;
}

.caixa:checked ~ .menu>div{
    transform: translateX(-50%) translateY(-50%);
}
.caixa:checked ~ .menu>div>div{
    opacity: 1;
}

.menu {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    visibility: hidden;
    transition: .6s;
}

.menu>div {
    position: absolute;
    width: 100%;
    height: 100vh;
    top: 50%;
    left: 50%;
    transform: translateX(-150%) translateY(-50%);
    background-color: rgba(0, 0, 0, 0.9);
    transition: .6s;
    display: flex;
    justify-content: center;
    align-items: center;
}

.menu>div>div {
    max-width: 90vw;
    max-height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
    text-align: center;
    opacity: 0
}
.menu >div>div>ul>li{
    list-style: none;
}
.menu >div>div>ul>li>a{
    text-decoration: none;
    margin: .5rem;
    display: inline-block;
    font-size: 1.2rem;
    font-weight: 550;
    text-transform: uppercase;
    color:#fff;
    transition: .3s;
}
.menu>div>div>ul>li> a :hover{
    color:#fff44f;
}