.sample2b {
  display    : inline-block;
  position   : relative;
}
.sample2b span {
  display    : inline-block;
  position   : absolute;
  top        : 0;
  left       : 0;
  bottom     : 0;
  right      : 0;
  background : linear-gradient(transparent 80%, rgba(0, 255, 0, 0.6) 60%);

}
.sample2b {
  font-size: 120%;
}

.sample2a {
  font-size: 120%;
}

.sample2a {
    background : linear-gradient(transparent 80%, #ffa64d 90%);


    body {
    　background-color: #000000;
    　color: #ffffff
    }
    caption {
    　font-size: 1em;
    　margin-bottom: 0.5em
    }
    thead {
    　background: #800000
    }
    tfoot {
    　background: #808000
    }
    tbody {
    　background: #008080
    }