CSS непрозрачность цвет фона
background: rgba(255, 255, 255, 0.25);
Lucas Juan
background: rgba(255, 255, 255, 0.25);.opacity30 {
opacity: 0.3;
filter: alpha(opacity=30); /* For IE8 and earlier */
}h1 {background-color:rgba(255,0,0,0.3);}.div{
opacity: 0.8; /* 1 means fully visible, 0 means invisible */
}