<div class="item">
  <form action="javascript()">
     <input type="phone" placeholder="Введите номер телефона">
     <input type="submit" balue="Получить предложение">
  </form>
</div>

*{
  margin: 0;
  padding: 0;
}

.item{
  padding: 50px 0;
  text-align: center;
  background: url(https://laintelligence.com/wp-content/uploads/2016/01/Los-Angeles-HD-Wallpapers-6.jpg);
  background-position: center;
}

input{
  width: 300px;
  height: 50px;
  border-radius: 12px;
  border: none;
  text-align: center;
  font-size: 16px;
}

[type="submit"]{
  background: #fdd059;
  color: #fff;
  width: 180px;
}

::placeholder{
  font-size: 16px
}