Przezroczystość w CSS

Question

Witam, czy jest możliwość ustawienia w CSS przezroczystości jakiegoś elementu z html na np. 50%, ale tak, aby elementy znajdujące się wewnątrz niego (div w divie) były widoczne w 100%.

Answer 1

https://developer.mozilla.org/en-US/docs/Learn/CSS/Howto/Make_box_transparent

https://css-tricks.com/almanac/properties/o/opacity/

Jeśli coś źle wstawiłem to przepraszam, ale tyle udało mi się znaleźć

Comments

Dzięki, zadziałało

Answer 2

Chyba najprościej jest uzyskać ten efekt jak już podał @Oskarejro,  przez color alpha channel (rgba), ale przez pewien trick można też za pomocą opacity.  

 

<div class="container">

  <div class="box">
    <div class="label-one">Lorem ipsum - box one<br>opacity</div>
    <div class="one"></div>
  </div>

  <div class="box two">
    <div class="label-two">Lorem ipsum - box two<br>color alpha channel</div>
  </div>

</div>

body, .container {
  margin: 0;
  padding: 0;
  border: 0;
  width: 100vw;
  height: 100vh;
  background-image: url(http://lorempixel.com/1200/1200/abstract);
}
.container {
  display: flex;
  justify-content: center;
  align-items: center;
  flex-direction: column;
}
.box {
  position: relative;
  width: 250px;
  height: 150px;
  margin: 2em;
  border: 2px solid black;
  display: flex;
  justify-content: center;
  align-items: center;
  font: 900 1.2em/2em monospace;
}
.box .label-one, .label-two {
  width: 80%;
  border: 2px solid black;
  background-color: white;
  text-align: center;
}

.one {
  position: absolute;
  width: 100%;
  height: 100%;
  background-color: green;
  opacity: 0.5;
}
.box .label-one {
  position: relative;
  z-index: 2;
}

.two {
  background-color: rgba(255,0,0,0.5);
}

 

Comments

Z linear-gradient, można uzyskać efekt "połowy" elementu bardziej przezroczystego.  

 

<div class="container">

  <div class="box">
    <div class="label-one">Lorem ipsum - div one<br>opacity</div>
    <div class="one"></div>
  </div>

  <div class="box two">
    <div class="label-two">Lorem ipsum - div two<br>color alpha channel</div>
  </div>

  <div class="box three">
    <div class="label-two">Lorem ipsum - div three<br>color alpha channel<br>linear-gradient</div>
  </div>  

</div>

body, .container {
  margin: 0;
  padding: 0;
  border: 0;
  width: 100vw;
  height: 100vh;
  background-image: url(http://lorempixel.com/1200/1200/abstract);
}
.container {
  display: flex;
  justify-content: center;
  align-items: center;
  flex-direction: column;
}
.box {
  position: relative;
  width: 300px;
  height: 150px;
  margin: 2em;
  border: 2px solid black;
  display: flex;
  justify-content: center;
  align-items: center;
  font: 900 1.2em/2em monospace;
}
.box .label-one, .label-two {
  width: 70%;
  border: 2px solid black;
  background-color: white;
  text-align: center;
}

.one {
  position: absolute;
  width: 100%;
  height: 100%;
  background-color: green;
  opacity: 0.5;
}
.box .label-one {
  position: relative;
  z-index: 2;
}

.two {
  background-color: rgba(255,0,0,0.5);
}

.three {
  background-image: linear-gradient(to right, rgba(0,0,0,0.9) 50%, transparent);
}

 

---

Można też przez zastosowanie np. ::before elementu html

  <div class="container">

    <div class="row">

      <div class="box">
        <div class="label-one">Lorem ipsum - div one<br>opacity</div>
        <div class="one"></div>
      </div>
      <div class="box two">
        <div class="label-two">Lorem ipsum - div two<br>color alpha channel</div>
      </div>

    </div>

    <div class="row">

      <div class="box three">
        <div class="label-three">Lorem ipsum - div three<br>color alpha channel<br>linear-gradient</div>
      </div>
      <div class="box four">
        <div class="label-three">Lorem ipsum - div four<br>opacity ::before</div>  
      </div>    

    </div>

  </div>

  body, .container {
    margin: 0;
    padding: 0;
    border: 0;
    width: 100vw;
    height: 100vh;
    background-image: url(http://lorempixel.com/1200/1200/abstract);
  }
  .container {
    display: flex;
    justify-content: center;
    align-items: center;
    flex-direction: row;
  }
  .box {
    position: relative;
    width: 300px;
    height: 150px;
    margin: 2em;
    border: 2px solid black;
    display: flex;
    justify-content: center;
    align-items: center;
    font: 900 1.2em/2em monospace;
  }
  .box .label-one, 
  .label-two, 
  .label-three {
    width: 70%;
    border: 2px solid black;
    background-color: white;
    text-align: center;
  }

  .one {
    position: absolute;
    width: 100%;
    height: 100%;
    background-color: green;
    opacity: 0.5;
  }
  .box .label-one {
    position: relative;
    z-index: 2;
  }

  .two {
    background-color: rgba(0,255,255,0.25)
  }

  .three {
    background-image: linear-gradient(to right, rgba(0,0,0,0.9) 50%, transparent);
  }

  .four {
    position: relative;
    z-index: 0;
  }
  .four::before {
    content: '';
    position: absolute;
    z-index: -1;
    width: 100%;
    height: 100%;
    background-color: yellow;
    opacity: 0.5;   
  }