body {
    font-family: Arial, sans-serif;
    margin: 0;
    padding: 0;
    background-color: #f5f7fa;
}

h1 {
    text-align: center;
    color: #ffffff;
    background-color: #1d3557;
    margin: 0;
    padding: 20px 0;
    font-size: 2.5em;
}

form {
    max-width: 20%;
    margin: 50px auto;
    background-color: #ffffff;
    padding: 20px;
    border-radius: 8px;
    box-shadow: 0px 0px 10px rgba(0, 0, 0, 0.1);
}

input[type="text"],
input[type="submit"] {
    padding: 15px;
    margin-bottom: 10px;
    border: 1px solid #dddddd;
    border-radius: 4px;
    font-size: 1em;
}

input[type="text"] {
    background-color: #f5f5f5;
    margin: 0 10%;
    margin-bottom: 5px;
    width: 80%;
}

input[type="submit"] {
    width: 100%;
    background-color: #1d3557;
    color: #ffffff;
    cursor: pointer;
    transition: background-color 0.3s;
}

input[type="submit"]:hover {
    background-color: #457b9d;
}

.message {
    text-align: center;
    margin: 20px 0;
    font-size: 1.2em;
}

.error {
    background-color: #e63946;
    color: #ffffff;
    padding: 10px;
    border-radius: 5px;
    display: inline-block;
    margin: 0 auto;
    text-align: center;
}

.short-url {
    color: #1d3557;
    background-color: #a8dadc;
    padding: 10px;
    border-radius: 5px;
    cursor: pointer;
    transition: background-color 0.3s;
    display: inline-block;
    margin: 0 auto;
}

.short-url:hover {
    background-color: #457b9d;
}

button {
    display: block;
    margin: 30px auto;
    padding: 15px 25px;
    font-size: 1em;
    color: #ffffff;
    background-color: #1d3557;
    border: none;
    border-radius: 5px;
    cursor: pointer;
    transition: background-color 0.3s;
}

button:hover {
    background-color: #457b9d;
}