body {
    font-family: Arial, Verdana;
}

h1 {
    margin-left: 20px;
}

#showResult {
    font-family: Arial, Verdana;
    font-size: x-large;
    font-weight: bold;
    text-align: center;
    display: none;
}

#numberrange {
    margin-right: 20px;
    margin-top: 10px;
    text-align: right;
    font-family: Arial, Verdana;
    font-size: large;
}

div[role="main"] {
    margin-left: auto;
    margin-right: auto;
    max-width: 1024px;
    border: 1px solid black;
    background-color: lightsteelblue;
}

#showFooter {
    margin-left: auto;
    margin-right: auto;
    max-width: 1024px;
    font-family: Arial, Verdana;
    font-size: small;
    text-align: left;
	background-color: white;
}

#practice {
    margin-left: auto;
    margin-right: auto;
    width: 95%;
    margin-top: 10px;
    display: -webkit-flex; /* Safari */
    display: flex;
    flex-flow:row wrap;
}

#practice > div {
    padding-top: 18px;
    margin-left: 10px;
    margin-right: 10px;
    -webkit-flex: 1;  /* Safari 6.1+ */
    -ms-flex: 1;  /* IE 10 */    
    flex: 1;
    min-width: 200px;
    max-width: 200px;
    height: 50px;
    font-family: Arial, Verdana;
    font-size: large;
    background-color: khaki;
    border: 5px solid lightsteelblue;
    text-align: center;
}

#buttons {
    margin-top: 20px;
    margin-bottom: 20px;
    margin-left: auto;
    margin-right: auto;
    width: 75%;
    display: -webkit-flex; /* Safari */
    display: flex; 
    flex-flow:row wrap;
}

 button {
    margin-left: 20px;
    margin-right: 20px;
    margin-bottom: 10px;
    -webkit-flex: 1;  /* Safari 6.1+ */
    -ms-flex: 1;  /* IE 10 */    
    flex: 1;
    min-width: 200px;
    max-width: 200px;
    height: 40px;
}

 button:hover {
     background-color: khaki;
 }

 #practice input {
     width: 50px;
     font-size: large;
 }