content is not placed in the Center of Div
i tried to make of form in the center of a div , t think all of values are correct but form doesn't get center this is the code the form goes in div of content but form stick to up of div , i don't know why
form#id {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  border-radius: 30px;
}
.container {
  width: 100%;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
}
.square {
  position: relative;
  width: 80vmin;
  border: solid white 5px;
  box-sizing: border-box;
  align-items: center;
  justify-content: center;
  border-radius: 30px;
}
.square:after {
  content: "";
  display: block;
  padding-bottom: 100%;
  align-items: center;
  justify-content: center;
}
.content {
  position: absolute;
  width: 100%;
  height: 100%;
  align-items: center;
  justify-content: center;
  border-radius: 29px;
}
html, body {
  width: 100%;
  height: 100%;
  margin: 0;
  padding: 0;
}<div class="container">
  <div class="square">
    <div class="content">
      <form id="id">
        <label for="input1">write ID</label>
        <input type="number" name="input1" id="input1" placeholder="id">
      </form>
    </div>
  </div>
</div> 
     
     
     
     
    