form {
  width: 100%;
  max-width: 400px;
  text-align: center;
  border: solid 1px #c2c2c2;
  padding-bottom: 10px;
  margin: auto;
  background: #fafafa;
}
input[type=textfield] {
    width: 75%;
    padding: 16px 32px;
    font-size: 16px;
    margin: 8px 0;
    border: 1px solid silver;
    border-radius: 1px;
    text-align: left;
    color: #333;
    background: #ccc;
}
input[type=button], input[type=submit], input[type=reset] {
    background-color: #4CAF50;
    border: none;
    color: white;
    padding: 16px 32px;
    font-size: 16px;
    min-width: 21%;
    text-decoration: none;
    margin: 4px 2px;
    cursor: pointer;
}

#boton {
    background-color: #4CAF50;
    border: none;
    color: white;
    padding: 16px 32px;
    font-size: 16px;
    min-width: 21%;
    text-decoration: none;
    margin: 4px 2px;
    cursor: pointer;
}

input[type=button]:hover, input[type=submit]:hover, input[type=reset]:hover {
  background-color: #333;
}

#calculadora {
    border: 3px solid lightgrey;
    border-radius: 10px;
    border-style: outset;
    margin: 0 auto;
    background-color: lightblue;
}

.lcd {
    margin-top: 10px;
    background-color: beige;
    border: 1px solid gray;
    border-style: inset;
    background: #feffe8;
    background: -moz-linear-gradient(-45deg, #feffe8 0%, #d6dbbf 100%);
    background: -webkit-linear-gradient(-45deg, #feffe8 0%, #d6dbbf 100%);
    background: linear-gradient(135deg, #feffe8 0%, #d6dbbf 100%);
    background-color: beige;
    border: 1px solid lightgray;
    border-radius: 7px;
    border-style: inset !important;
}

#pantalla #num {
    width: 100%;
    height: 60px;
    font-size: 24px;
    padding: 5px 5px 5px 30px;
}

.p-handle {
    border-right: 1px solid burlywood;
    border-radius: 7px 0 0 7px;
    position: absolute;
    background-color: bisque;
    cursor: move;
}

#pant-handle {
    width: 25px;
    height: 58px;
    margin: 11px 1px 1px 1px;
}



#calculadora > .row {
    margin: 10px 0 20px;
}

#teclado .row .row {
    margin: 0 0px;
}

.container .panel-footer {
    margin-top: 20px;
    height: 3em;
}

@media (max-width: 767px) {
    #calculadora {
        width: 330px;
    }
    .bd2 {
        margin-top: 10px;
    }
}

@media (min-width: 768px) and (max-width: 991px) {
    #calculadora {
        width: 700px;
        /*margin: 0 auto;*/
    }
    .bd2 {
        margin-top: 0;
    }
}

@media (min-width: 992px) and (max-width: 1199px) {
    #calculadora {
        width: 700px;
        margin: 0 auto;
    }
    #teclado .row .row {
        margin: 0 0px;
    }
    .bd2 {
        margin-top: 0;
    }
}

@media (min-width: 1200px) {
    #calculadora {
        width: 800px;
    }
    .bd2 {
        margin-top: 0;
    }
}

@media (orientation:landscape) {
    #xcalc_main {
        width: 100vh;
    }
}

@media (orientation:portrait) {
    #xcalc_main {
        width: 100%;
    }
}