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HTML 

              
                <div id="form" class="form">
  <div id="heading" class="glass glass--gradient glass--heading">
    
    <span class="form-header">
      <span class="form-icon"></span><span class="form-title">What would you like to build today?</span> </span>
    <button class="form-close-button">✕</button>
  </div>
  <div id="input" class="glass">
    <input type="text" placeholder="Type your request here">
  </div>
</div>
!

CSS 

              
                :root{
    --r: 20px;
    --c: #171717;
    --light-reflect: inset -5px 20px 2px -20px #fff, inset 5px -20px 2px -20px #fff;
    --shadow-reflect: inset -19px 1px 2px -20px #000,inset 19px 1px 2px -20px #000, inset 19px 1px 2px -20px #000, inset -15px -26px 3px -30px #000;
    --hh : 8rem;
}

body{
  display:flex;
  padding: 0 2rem;
  color: var(--c);
  font-family: sans-serif;
  align-items:center;
  justify-content:center;
  min-height: 100svh;
  background: radial-gradient(#ffffff54 2px, transparent 0) 0 0/40px 40px, radial-gradient(#00000026 2px, transparent 0) -1px 1px/40px 40px, radial-gradient(ellipse at 150% -50%, #6d788f, #fff);
}

.form{
  position: relative;
  --gap: .5rem;
  max-width: 50rem;
  flex: 1 1 auto;
  height: var(--hh);
  &.open{
    height: calc(var(--hh) * 1.5  + var(--gap));
  }
  transition: 250ms ease all;
}
button{
  appearance: none;
  border: none;
  background: none;
}
input{
  appearance: none;
  border: none;
  background: none;
  width: 100%;
  height: 4rem;
  padding: 0 2rem;
  color: var(--c);
  &:focus{
    outline: none;
  }
  &::placeholder{
    opacity: 0.3;
  }
}
@keyframes text {
	0% {
    clip-path:polygon(0 0, 0 0, 0 100%, 0 100%)
	}
	100% {
    clip-path:polygon(0 0, 100% 0, 100% 100%, 0 100%)
	}
}
.form-title{
      clip-path:polygon(0 0, 0 0, 0 100%, 0 100%);
  animation: text linear 1s forwards;
  animarion-delay: 1s;
}
@keyframes gradient {
	0% {
    background-size: 100%;
	}
	50% {
    background-size: 150%;
	}

	100% {
    background-size: 100%;
	}
}

.glass{
    position:relative;
    display: flex;
    align-items: center;
    min-height: 4rem;
    border-radius: var(--r);
    border:none;
    width: 100%;
    background: rgba(#fff, 0.1);
    backdrop-filter: blur(2px);
    text-shadow: 0.25em  0.25em 1px #00000010;
  
  --shadow-color: 0deg 0% 64%;
  --shadow-elevation-high:
    0.5px 1px 1.1px hsl(var(--shadow-color) / 0.28),
    1.4px 3.1px 3.4px -0.4px hsl(var(--shadow-color) / 0.27),
    2.5px 5.3px 5.9px -0.7px hsl(var(--shadow-color) / 0.25),
    3.9px 8.4px 9.3px -1.1px hsl(var(--shadow-color) / 0.24),
    6px 12.9px 14.3px -1.5px hsl(var(--shadow-color) / 0.23),
    9px 19.5px 21.6px -1.8px hsl(var(--shadow-color) / 0.21),
    13.4px 28.9px 32px -2.2px hsl(var(--shadow-color) / 0.2),
    19.3px 41.7px 46.2px -2.6px hsl(var(--shadow-color) / 0.19),
    27.1px 58.5px 64.8px -2.9px hsl(var(--shadow-color) / 0.17),
    37.1px 80px 88.6px -3.3px hsl(var(--shadow-color) / 0.16);
  
  --inner-light: inset 0 -6px 2px -5px #ffffff24, inset 0 -8px 3px -5px #ffffff3b, inset 0 -20px 10px -15px #ffffff5c, inset 7px 25px 10px -20px #ffffff5c;
  --inner-shadow: inset -20px 5px 10px -20px #00000021, inset -40px 50px 7px -55px #00000021;
  --external-light: 5px -30px 30px -20px #ffffff70, 5px 10px 30px -20px #ffffff70;
  --default: var(--external-light), var(--shadow-elevation-high), var(--inner-light), var(--inner-shadow);
  box-shadow:var( --default);
    &:focus{
      outline: none;
    }
    &--gradient{
      background-position: center;
      animation: gradient 10s linear infinite;
      background: linear-gradient(45deg, #85d5e757, #7a9ed254, #ba6ac93d, #de54c217, #f86b2d4f);
    }
    &--heading{
      font-size: 1.1rem;
      &:before{
        --i: 2px;
        opacity:0.6;
      }
      &:after{
        --i: 4px;
      }
      &:before,&:after{
        content: '';
        pointer-events: none;
        position: absolute;
        inset: var(--i);
        border-radius: calc(var(--r) - var(--i));
        box-shadow:var(--light-reflect), var(--shadow-reflect);
      }
    }
    > * {
      position:relative;
      z-index: 1;
    }
  &:before{
    --r: 20px;
    --bp : 50px;
    --s: calc(0% + var(--bp) + var(--r));
    --e: calc(100% - var(--bp) - var(--r));
    --z: calc(0% + var(--bp));
    --h: calc(100% - var(--bp));
    content: '';
    position: absolute;
  }
}
.form-header{
  height: var(--hh);
  padding: 0 2rem;
  display: flex;
  align-items: center;
  gap: 2rem;
}
@keyframes icon {
	0% {
		rotate: 0deg;
      scale: 0.8;
    filter: hue-rotate(0deg)
	}
	50% {
		rotate: 180deg;
    scale: 1.2;
    filter: hue-rotate(90deg)
	}

	100% {
		rotate: 360deg;
      scale: 0.8;
    filter: hue-rotate(0deg)
	}
}
.form-icon{
  position: relative;
  background: rgba(#fff,0.2);
  display: block;
  aspect-ratio: 1;
  flex: 0 0;
  border-radius: 50px;
  height: 4rem;
  box-shadow:var(--light-reflect), var(--shadow-reflect);
  &:before{
    animation: icon 5000ms cubic-bezier(0.22, 0.61, 0.36, 1) infinite;
    content: '';
    position: absolute;
    inset:0;
  background: url(https://cdn.discordapp.com/attachments/1050016262035619861/1159132066592591893/ia.png?ex=651ec55c&is=651d73dc&hm=162828e7743ded23e27d4fe81ee09e4df9f283e32a32bc322b99c116a4f307b7) center / 90% 90% no-repeat;
  }
}
.form-close-button{
  position: absolute;
  color: var(--c);
  background: rgba(#fff,0.3) ;
  top: .75rem;
  right: .75rem;
  box-shadow:var(--light-reflect), var(--shadow-reflect);
  display: grid;
  place-content: center;
  height: 1.5rem;
  width: 1.5rem;
  border-radius: 50px;
  cursor: pointer;
  visibility: hidden;
  opacity: 0;
  transition: 250ms ease opacity;
  .open &{
    visibility: visible;
    opacity: 1;
  }
}
[id='heading']{
  transition: 250ms ease all;
  .form:not(.open) &:hover{
    scale:0.99;
    filter: brightness(0.95);
  }
  .form:not(.open) &:active{
    scale:0.98;
    filter: brightness(0.8);
  }
  cursor: pointer;
}
[id='input']{
  position: absolute;
  top: 0;
  left: 0;
  z-index:-1;
  height: var(--hh);
  transition: 500ms ease all;
  translate: 0 0;
  opacity:0;
  .open &{
    translate: 0 calc(var(--hh) + var(--gap));
    height: calc(var(--hh) / 2);
    opacity:1;
    z-index:2;
  }
}
!

JS 

              
                const form = document.getElementById("form");
const heading = document.getElementById("heading");
heading.onclick = (e) => {
  form.classList.toggle('open')
}
!
999px

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