body{background-color: rgb(30, 32, 32);
    color: azure;
    font: Verdana;
}
header {
    background-image: url(migolkvb-truong-quoc-hoc-hue-thumb_optimized.jpg);
    background-size: cover;
    background-position: center;
    padding-bottom: 7.5vh;
    padding-top: 2vh;
    margin-top: 0;
    border-top: 0;
    font: Verdana;
    font-size: 2vmax;
    line-height: 1vh;
    padding-left: 2vw
}

h1 {
    line-height: 1vmax
}

h4 {
    line-height: 2vmax;
}

nav {
    display: flex;
    background-color: rgb(126, 16, 16);
    margin: 0;
    border: 0;
    padding: 0.5vh; }
 


nav :hover {color: #ff7b00;
    font-weight: bolder;



}








a {
    margin-left: 3vw;
    font-size: 1vmax;
    color: rgb(255, 208, 0);


}

.pic {
    display: inline-block;
    max-width   : 35vmax;
    margin: 2vmax;
}


#ln1 {text-align: center
      font-size: 2vmax;
     }
#nhungngaygiongbao {
                    font-size: 1vmax; }
    
    
}
    


#shadowBox {
    background-color: rgb(0, 0, 0);
    background-color: rgba(0, 0, 0, 0.2);
    border: 3px solid;
}

    #shadowBox {
    background-color: rgb(0, 0, 0);
    /* Fallback color */
    background-color: rgba(0, 0, 0, 0.2);
    /* Black w/opacity/see-through */
    border: 3px solid;
}

    
}


.rainbow {
    text-align: center;
    text-decoration: underline;
    font-size: 32px;
    font-family: monospace;
    letter-spacing: 5px;
}
.rainbow_text_animated {
    background: linear-gradient(to right, #6666ff, #0099ff , #00ff00, #ff3399, #6666ff);
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
    animation: rainbow_animation 6s ease-in-out infinite;
    background-size: 400% 100%;
}

@keyframes rainbow_animation {
    0%,100% {
        background-position: 0 0;
    }

    50% {
        background-position: 100% 0;
    }
}