html {
    text-align: center;
}
body {
    display: inline-block;
}
.flash_message {
    position: relative;
    padding: 1em;
    color: white;
    background: green;
}
.flash_message a {
    position: absolute;
    top: 0px;
    right: 0px;
    margin-left: 0.5em;
    padding: 0.3em;
    color: white;
    text-decoration: none;
    font-family: sans-serif;
    font-weight: bold;
}
.complaint {
    display: block;
    padding-bottom: 1em;
    color: red;
}
ul {
    padding: 0px;
    text-align: left;
}
li {
    display: block;
    margin: 2px;
    padding: 2px 4px;
}
li.from {
    background-color: lightgreen;
}
li.to {
    background-color: pink;
}
form {
    display: block;
    float: left;
    clear: both;
    margin-left: auto;
    margin-right: auto;
    padding: 1em;
    box-shadow: 10px 10px 5px #aaa;
    border: 1px solid black;
}
label {
    display: block;
    text-align: center;
}