<header>
         <span>CyberExpress</span>
     </header>
     <main>
         <h1>Caixa de Sugestões</h1>

         <p>Escreva na caixa de texto abaixo o que podemos fazer para melhorar
         o espaço do CyberExpress. Deixe seu elogio, crítica ou sugestão abaixo e
         envie pra gente!</p>

         <form>
             <textarea minlength=20  maxlength=255 name="sugestao"></textarea>
             <button type="submit">Enviar sugestão</button>
         </form>
     </main>
     <footer>
         Copyright 2022 - CyberExpress
     </footer>
*
{
    margin: 0;
    padding: 0;
}

header
{
    width: 100%;
    height: 55px;
    padding: 20px;
    box-sizing: border-box;
    background: #00318b;
    color: #f8f8f8;
    font-family: sans-serif;
    font-size: 16px;
}

footer
{
    width: 100%;
    height: 55px;
    position: sticky;
    bottom: 0;
    padding: 20px;
    box-sizing: border-box;
    text-align: center;
    font-family: sans-serif;
    background: #f8f8f8;
    color: #00318b;
}

main {
    display: flex;
    flex-direction: column;
    width: 100%;
    max-width: 430px;
    margin: 30px auto;
    height: 100%;
}

form {
    display: flex;
    flex-direction: column;
    width: 100%;
}

textarea {
    height: 120px;
    margin: 30px 0 25px 0;
    padding: 10px;
    font-size: 18px;
}

button {
    background: #00318b;
    border: none;
    height: 32px;
    font-family: sans-serif;
    font-size: 16px;
    color: #fff;
}

p {
    margin: 20px 0 0 0;
    line-height: 30px;
    font-family: sans-serif;
}

h1 {
    font-family: sans-serif;
    color: #00318b;
}

External CSS

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