*{
    box-sizing: border-box;
    padding: 0;
    margin: 0;
}
body{
   background-color: #CEF9F2;
   font-size: 25px;
   font-family: 'Lucida Sans', 'Lucida Sans Regular', 'Lucida Grande', 'Lucida Sans Unicode', Geneva, Verdana, sans-serif;

}
ul{
    list-style: none;
}
nav{
    max-width: 900px;
    margin: auto;
    background-color: #333;
    font-size: 20px;
    margin-top: 50px;
}
.menu{
    list-style: none;
    display: flex;
    justify-content: space-around;
}
.menu > li > a{
display: block;
padding: 15px 20px;
color: #C1C1C1;
text-decoration: none;
}
.menu > li:hover{
    background-color: #2C4251;
}
.semi{
    position: absolute;
    display: none;
    list-style: none;
    width: 200px;
    background-color: rgba(0, 0, 0, .5);
}
.menu li:hover .semi{
    display: block;
}
.semi li:hover{
    background-color: #2C4251;
}
.semi li a{
    display: block;
    color: #C1C1C1;
    padding: 15px 15px 15px 20px;
    text-decoration: none;
}

#contenedor{
    border: solid 1px black;
    width: 80%;
    margin: 0 auto;
    padding: 20px;
    text-align: center;
}

fieldset{
    margin-bottom:10px ;
}
legend{
    border: solid 1px violet;
    padding: 6px;
    font-weight: bold;
    border-radius: 20px;
    background-color: #AFC1D6;
}
img{
    margin: 5px;
    border: solid 2px black;
    transition: all 300ms;
}

.imgs{
    width: 15%; 
    height: 15%;
}
/*QUIZ*/
#containers{
    width: 60%;
    background-color: gainsboro;
    margin: 20px auto;
    overflow: auto;
    padding: 25px;
}
#kbeza{
    text-align: center;
    border-bottom: #fff dashed 1px;
}

#quizzz{
    min-height: 410px;
}

input[type='submit']{
background: blueviolet;
border: 0;
color: #fff;
padding: 10px 15px;
cursor: pointer;
}

#resultado h3 {
    background: blueviolet;
    padding: 10px;
    margin: 10 px 0;
}
#resultado span{
    color: #000;
    font-weight: bold;
}
legend{
    text-align: left;
}
.biblio{
    text-align:  justify;
    font-size: 18px;
    font-family: 'Times New Roman', Times, serif;
}
.txt{
    text-align: justify;
}