.c-item {position: relative; max-width: 380px;} /*aplicar em três colunas*/
.d-item {position: relative; max-width: 262px;} /*aplicar em quatro colunas*/
.e-item {position: relative; max-width: 165px;}
.c-item .btn-novaAba {
    position: absolute;
    top: 0;
    right: 0;
    z-index: auto;
    display: block;
    width: 40px;
    height: 40px;
    background-color:rgba(0, 0, 0, 0.5);
    z-index: 10;
    color: #ffffff;
}
.c-item .btn-novaAba span {
    font-size: 2em;
    color: inherit;
    padding: 10px 0 0 10px;

}
.d-item .btn-novaAba {
    position: absolute;
    top: 0;
    right: 0;
    z-index: auto;
    display: block;
    width: 40px;
    height: 40px;
    background-color:rgba(0, 0, 0, 0.5);
    z-index: 10;
    color: #ffffff;
}
.d-item .btn-novaAba span {
    font-size: 2em;
    color: inherit;
    padding: 10px 0 0 10px;

}
.e-item .btn-novaAba {
    position: absolute;
    top: 0;
    right: 0;
    z-index: auto;
    display: block;
    width: 30px;
    height: 30px;
    background-color:rgba(0, 0, 0, 0.5);
    z-index: 10;
    color: #ffffff;
}
.e-item .btn-novaAba span {
    font-size: 2em;
    color: inherit;
    padding: 5px 0 0 5px;

}