body{
     background: #136a8a;  /* fallback for old browsers */
    background: -webkit-linear-gradient(to right, #267871, #136a8a);  /* Chrome 10-25, Safari 5.1-6 */
    background: linear-gradient(to right, #267871, #136a8a); /* W3C, IE 10+/ Edge, Firefox 16+, Chrome 26+, Opera 12+, Safari 7+ */ 
}

h1{
    text-align: center;
    color: white;
    padding-top: 1%;
    font-family:fantasy;
}

#valor2{
    margin-bottom: 2%;
}
.divPrincipal{
    padding-bottom: 2%;
    padding: 1%;
    margin: 3%;
    background:#509ea8;
    border-radius: 5px;
}

#botones{
    width:100%;
    display:flex;
    flex-direction: row;
    flex-wrap: wrap;
}
#limpiar{
    margin-left: 33%;
}
button{
    cursor: pointer;
    font-family: sans-serif;
    font-size: 14px;
    cursor: pointer;
    transition: all 30ms;
    margin: 2px;
    width: 31%;
    border: solid 1px royalblue;
    border-radius: 2px;
    
}
button:hover{
    background: royalblue;
    color: white;
    transform: scale(1.15);
    border:solid 1px red;
    
}


article div {
    width :22%;
    background: #EEEEEE;
    padding:1%;
    padding-top: 2%;
    border-radius: 6px;
}

article div h1{
    font-size: 20px;
    margin-top: 1px;
    margin-bottom: 8px;
    width: 80%;
    font-family: sans-serif;
    color: royalblue;
    background-color:white;
    border-radius: 5px;
    border: royalblue solid;
    padding: 8%;
}

footer{
    background : #EEEEEE;
    border-radius: 5px;
    padding : 2px;
    display : flex;
}

.footer-p{
    color : black;
    font-weight: bolder;
    font-size: 20px;
    width : 50%;
    font-style: oblique;
    text-align: center
}