:root{
    --corback-signup: #436996;
}


.slider_imagens{
    display: block;
    height: 300px;
    width: 500px;
    margin: auto;
    margin-top: 20px;
    position: relative;
    left: 15%;

}

.slider_imagens li{
    list-style: none;
    position: absolute;
    left: 30%;
    top: 40%;
}

.slider_imagens img {
    margin: auto;
    height: 100%;
    width: 100%;
    vertical-align: middle;
}

.slider_imagens input {
    display: none;
}

.slider_imagens label {
    background-color: var(--corback-signup);
    top: 50%;
    cursor: pointer;
    display: block;
    height: 15px;
    position: relative;
    left: 80%;
    width: 15px;
    z-index: 10;
    border-radius: 10px;
}

.slider_imagens li:nth-child(1) label {
    left: 30%;
}

.slider_imagens li:nth-child(2) label {
    left: 20%;
}

.slider_imagens li:nth-child(3) label {
    left: 40%;
}

.slider_imagens li:nth-child(4) label {
    left: 60%;
}


.slider_imagens img {
    opacity: 0;
    visibility: hidden;
}

.slider_imagens li input:checked ~ img {
    opacity: 1;
    visibility: visible;
    z-index: 10;
}