.form {
    display: block;
    width: 500px;
}

.input-field {
    display: block;
    width: 100%;
    border: 1px solid blue;
    border-radius: 0;
    padding: 20px 28px;
    margin-bottom: 5px;
    font-size: 20px;
}

.send-btn {
    border: none;
    padding: 20px 28px;
    background-color: blue;
    color: white;
    font-size: 16px;
    cursor: pointer;
    transition: background-color .2s;
}

.send-btn:hover {
    background-color: rgb(55, 55, 255);
}

.send-btn:active {
    background-color: rgb(31, 31, 190);
}

.error .input-field {
    border-color: red;
}

.error-label {
    display: block;
    color: red;
    margin-bottom: 10px;
}