body {
    font-family: Arial, Helvetica, sans-serif;
    color: darkslategray;
    background-color: lightgray;
}

#container {
    background-color: white;
    padding: 10px;
    border: 2px solid darkslategray;
}

#conversion_input {
    font-size: 16px;
}

#input {
    font-size: 16px;
    margin-right: 10px;
}

#conversion_options {
    padding: 15px;
    margin: 10px;
    margin-left: 0;
    text-align: left;
    display: inline-block;
}

h2 {
    font-size: 16px;
    font-weight: normal;
}

button {
    font-size: 16px;
    background-color: gray;
    color: black;
    border: 1px solid lightgray;
    box-shadow: 2px 2px 5px gray;
    padding: 5px 10px;
    cursor: pointer;
}