Gray space showing during the media query set with

the website
not sure if i did something wrong with the media query or if its devtools but when i pick specific demnsion like se xr or 14 pro the media query looks fine but randemly if i pick between them gray space starts showing like if the elements dont have a 100% width or if im just picking specific sizes its fine but when i pick responsive grayspace starts to show even if i go back to a specific dimension like se or xr.
i tried making all the secdtions 100% both in regular and the media query n grayspace starts to show

* {
  margin: 0;
  padding: 0;
}
@font-face {
  font-family: "ROG";
  src: url("ASUSROG_REGULAR.TTF");
}

body,
html {
  scroll-padding-top: 12rem;
}
body {
  display: grid;
  grid-template-columns: 100%;
  grid-template-rows: 100vh 100vh 100vh;
  font: 15px Arial, sans-serif;
  background-color: #525152;
  max-width: 100%;
}
#header {
  position: fixed;
  display: flex;
  justify-content: space-between;
  width: 100%;
  top: 0;
  padding: 20px;
  background-color: #000;
}
#header h1 {
  font-size: 2rem;
  font-family: "ROG", "Open Sans", "Helvetica Neue", sans-serif;
  color: #de272c;
}
#header img {
  width: 5rem;
  height: 5rem;
}
#img-container {
  display: flex;
  gap: 40px;
  align-items: center;
}
#img-container h1 {
  color: #f3f3f3;
}

#nav-bar {
  display: flex;
  justify-content: flex-end;
  align-items: center;
  padding: 30px;
  gap: 100px;
  padding-right: 60px;

  width: 50%;
  font-size: 2rem;
}
a {
  text-decoration: none;
}
a:link {
  color: #f3f3f3;
}
a:hover {
  color: #de272c;
}
a:active {
  color: #de272c;
}
#form {
  margin-top: 136px;
  display: flex;
  padding: 20px;
  font-size: 1.5rem;
  flex-direction: column;
  justify-content: space-between;
  align-items: center;
  gap: 20px;
  background-image: url("https://dlcdnwebimgs.asus.com/files/media/C03ED571-0D4B-47B3-90B0-BEF72BB26C05/v1/images/large/1x/pic_kv.webp");
  background-repeat: no-repeat;
  background-size: cover;
  background-position: center center;
}

.product-name {
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  gap: 20px;
}
.product-name h1 {
  color: #f3f3f3;
  font-family: "ROG", "Open Sans", "Helvetica Neue", sans-serif;
  font-size: 5rem;
}
.product-name p {
  color: #0ff;
}
.form-content {
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  gap: 20px;
}
#email {
  width: 25rem;
  height: 2rem;
  text-align: center;
}
#submit {
  width: 15rem;
  height: 4rem;
  font-size: 2rem;
  background-color: #000;
  color: #f3f3f3;
  border-radius: 40px;
  border: none;
}
.submit-container {
  display: inline-flex;
  padding: 4px;
  border-radius: 40px;
  grid-area: input;
  background: linear-gradient(
    90deg,
    #ff0000,
    #ff7e00,
    #ffff00,
    #00ff00,
    #00ffff,
    #002cff
  );
  width: fit-content;
  height: fit-content;
}
#features {
  display: flex;
  flex-direction: column;
  background-color: #000;
  gap: 20px;
  color: #f3f3f3;
}
#feature-names {
  display: grid;
  grid-template-columns: 1fr 1fr 1fr;
  grid-template-areas: "ul ul ul" ". input .";
  grid-template-rows: 1fr 1fr;
  justify-content: center;
  justify-items: center;
  height: 40%;
  gap: 20px;
}
#feature-names ul {
  grid-area: ul;
  list-style: none;
  display: flex;
  justify-content: center;
  gap: 100px;
  font-size: 2.5rem;
  align-items: center;
}
#feature-names ul li img {
  width: 8rem;
}
#feature-names input {
  background-color: #000;
  width: 15rem;
  height: 4rem;
  font-size: 2rem;
  color: #f3f3f3;
  border-radius: 40px;
  border: none;
}
@media only screen and (max-width: 436px) {
  #header {
    font-size: 2px;
  }
  #header #nav-bar {
    display: flex;
    justify-content: center;
    width: 100%;
    top: 0;
    padding: 5px;
  }

  #form {
    background-color: #000;
    margin-top: 120px;
    background-image: none !important;
    justify-content: center;
    align-items: center;
  }
  #features{
    gap: 60px;
  }
  #feature-names {
    grid-template-columns: 1fr;
    grid-template-rows: 1fr 1fr 1fr;
    grid-template-areas: "ul" "input";
  }
  #feature-names ul {
    grid-area: ul;
    list-style: none;
    display: flex;
    flex-direction: column;
    justify-content: center;
    gap: 20px;
    font-size: 2rem;
    align-items: center;
  }
}

xr


se before resp

se after responsive