html {
    height: 100%;
    overflow: auto;
    padding: 0;
    margin: 0;
}

body {
    padding: 0;
    margin: 0;
    background-image: url("../imagen/fondo.png");
    background-repeat: no-repeat;
}
#div_exterior {
    height: 100%;
    width: 100%;
}

#div_interior {
    padding-top: 25px;
    height: 100%;
    width: 100%;
    text-align: left;
    vertical-align: middle;
}
#cuerpo {
    margin-left: 25px;
    margin-right: 25px;
    width: auto;
    justify-content: center;
}
#titulo {
    height: 34px;
    width: auto;
    border: 4px solid rgb(255 194 0);
}

#flecha {
    float: left;
    width: 205px;
    height: 34px;
    display: inline;
    margin: 0px 0px 0px 0px;
    text-indent: 15px;
    text-align: left;
    font-size: x-large;
    font-family: 'Nunito Sans', sans-serif;
    color: white;
    background-image: url("../imagen/flecha.png");
    background-repeat: no-repeat;
}

#texto_titulo {
    height: 34px;
    margin: 0px 0px 0px 0px;
    text-align: left;
    font-size: x-large;
    font-family: 'Nunito Sans', sans-serif;
    color: maroon;
    font-synthesis: weight;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    
}

#linea {
    margin-top: 10px;
    width: auto;
    background-color: rgb(255 194 0);
    font-size: 5px;
}
#subtitulo {
    text-align: left;
    height: 20px;
    font-size: large;
    font-family: 'Nunito Sans', sans-serif;
    color: darkred;
    font-synthesis: weight;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}
.num_ejercicio {
    text-align: left;
    height: 30px;
    font-size: 24px;
    font-family: 'Nunito Sans', sans-serif;
    color: chocolate;
    font-synthesis: weight;
}
.text_ejercicio {
    text-align: left;
    height: auto;
    font-size: 20px;
    font-family: 'Nunito Sans', sans-serif;
    color: black;
}
.negrita {
    font-size: 20px;
    font-family: 'Nunito Sans', sans-serif;
    color: firebrick;
}
#ejercicio1, #ejercicio2 {
    text-align: left;
    padding-left: 25px;
    vertical-align: central;
}
#et_num_ej1 {
    float: left;
    height: 54px;
    width: 165px;
    background-color: lightgray;
    border: inset;
    vertical-align: central;
    color: black;
    padding-right: 8px;
    text-align: right;
    font-size: 38px;
    font-family: 'Orbitron', sans-serif;
}
#boton_ej1, #boton_ej2 {
    float: left;
    height: 58px;
    width: 100px;
    background-color: white;
    border: 2px solid orange;
    text-align: center;
    font-size: 20px;
    font-family: 'Nunito Sans', sans-serif;
    color: black;
    cursor: pointer;
    transition-duration: 0.5s;
    border-radius: 5px;
    box-shadow: 0 3px chocolate;
}
#boton_ej1:hover, #boton_ej2:hover {
    background-color: orange;
}
#boton_ej1:active, #boton_ej2:active {
    box-shadow: 0 0px black;
    transform: translateY(3px);
}
#regs_ej1, #regs_ej2 {
    border: none;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: clip;
}
.reg_ej1, .reg_ej2 {
    height: 54px;
    width: 34px;
    min-width: 34px;
    background-color: lightgray;
    border: 1px solid;
    vertical-align: central;
    color: black;
    text-align: center;
    font-size: 30px;
    font-family: 'Orbitron', sans-serif;
    cursor: pointer;
    transition-duration: 0.5s;
}
.reg_ej1:hover, .reg_ej2:hover {
    background-color: lightyellow;
}
.reg_ej1:active, .reg_ej2:active {
    transform: rotateX(180deg);
 }
#boton_cej1, #boton_cej2 {
    float: left;
    height: 58px;
    width: 100px;
    background-color: antiquewhite;
    border: 2px solid orange;
    text-align: center;
    font-size: 20px;
    font-family: 'Nunito Sans', sans-serif;
    color: black;
    cursor: pointer;
    transition-duration: 0.5s;
    border-radius: 5px;
    box-shadow: 0 3px chocolate;
}
#boton_cej1:hover, #boton_cej1:hover {
    background-color: orange;
}
#boton_cej1:active, #boton_cej2:active {
    box-shadow: 0 0px black;
    transform: translateY(3px);
}
#et_num_ej2 {
    float: left;
    height: 54px;
    width: 105px;
    background-color: lightgray;
    border: inset;
    vertical-align: central;
    color: black;
    padding-right: 8px;
    text-align: right;
    font-size: 38px;
    font-family: 'Orbitron', sans-serif;
}
.etiqueta {
    float: left;
    height: 54px;
    width: 65px;
    vertical-align: central;
    color: black;
    padding-right: 8px;
    padding-top: 12px;
    text-align: right;
    font-size: 38px;
    font-family: 'Orbitron', sans-serif;
}
.box_octal {
    float: left;
    height: 54px;
    width: 95px;
    background-color: lightgray;
    border: inset;
    vertical-align: central;
    color: black;
    padding-right: 8px;
    text-align: right;
    font-size: 38px;
    font-family: 'Orbitron', sans-serif;
    letter-spacing: 0;
}