forma.html

<div class="forma">
  <span class="naslov">Contact me</span>
  <label>Name [text* your-name placeholder "Your name here"]</label>
  <label>Email [email* your-email placeholder "Your email here"]</label>
  <label>Subject [text your-subject placeholder "Your subject here"]</label>
  <label>Message [textarea your-message placeholder "Your message here"]</label>
  [submit "Send"]
</div>

stil.css

.forma {
    width: 100%;
    background: #f1f1f1;
    font-family: GT-Walsheim-Pro-Regular;
    box-sizing: border-box;
    padding: 10px;
    font-size: 16px;
}

.forma label {
    color: black;
    font-family: GT-Walsheim-Pro-Regular;
    font-size: 14px;
    margin: 0;
    display: block;
}

.forma input,
.forma textarea {
    width: 100%;
    padding: 10px;
    border:0;
    outline:0;
    border-radius: 8px;
    box-shadow: 0 1px 1px rgba(0, 0, 0, 0.1);
    resize: none;
    box-sizing: border-box;
    font-family: GT-Walsheim-Pro-Regular;
    margin-bottom: 8px;
    margin-top: 4px;
}

.forma input[type="submit"] {
    background: #e74c3c;
    color: white;
    cursor: pointer;
    font-family: GT-Walsheim-Pro-Regular;
}

.forma input[type="submit"]:hover {
    box-shadow: 0 1px 1px 1px rgba(170, 170, 170, 0.6);
}

.forma input:focus {
    box-shadow: 0 0 2px rgba(231, 76, 60, 1) !important;
}

div.wpcf7-validation-errors {
    display: none !important;
}

.forma .naslov {
    color: black;
    font-size: 30px;
    display: block;
    word-break: break-all;
}

.forma span[role="alert"] {
    color: #e74c3c;
    font-size: 14px;
    margin: 0;
    padding: 0;
    font-family: GT-Walsheim-Pro-Regular;
    line-height: 14px;
}