.nav_tabs{
    width: 100%;
    height: 400px;
    margin: 140px auto;
    position: relative;
    margin-top:50px;
}
.nav_tabs ul{
    list-style: none;
}
.nav_tabs ul li {
    float: left;	
}
.nav_tabs label {
    width: 272px;
    padding: 27px;
    background-color: #ffff;
    display: block;
    opacity: 35%;
    cursor: pointer;
    text-align: center;
    height: 275px;
}    
.rd_tabs:checked ~ label{
    position: relative;
    top: 25px;
    color: #ff0000;
    opacity: 100%;
    background-image: url('../Imagem/setinha.png');
    background-repeat: no-repeat;
    background-position: center;
    background-position-y: 254px; 
}
.rd_tabs {
    display: none;
}
.content_2 {
    background-color: rgb(255, 255, 255);
    position: absolute;
    display: none;
    height: 320px;
    width: 980px;
    left: 0;
}
.rd_tabs:checked ~ .content_2 {
    display: block;
}