<div class="prompt-container">
  <div class="glow-wrapper">
    <div class="input-box">
      <textarea id="prompt-area" placeholder="Describe what you want to generate..." rows="1"></textarea>
      
      <div class="actions">
        <button class="attach-btn" aria-label="Attach file">
          <svg viewBox="0 0 24 24" width="20" height="20" fill="none" stroke="currentColor" stroke-width="2">
            <path d="M21.44 11.05l-9.19 9.19a6 6 0 0 1-8.49-8.49l9.19-9.19a4 4 0 0 1 5.66 5.66l-9.2 9.19a2 2 0 0 1-2.83-2.83l8.49-8.48"></path>
          </svg>
        </button>
        <button class="submit-btn" aria-label="Submit prompt">
          <svg viewBox="0 0 24 24" width="20" height="20" fill="none" stroke="currentColor" stroke-width="2">
            <line x1="12" y1="19" x2="12" y2="5"></line>
            <polyline points="5 12 12 5 19 12"></polyline>
          </svg>
        </button>
      </div>
    </div>
  </div>
</div>

*, *::before, *::after {
  box-sizing: border-box;
}

body {
  font-family: system-ui, "Segoe UI", Roboto, Helvetica, Arial, sans-serif, "Apple Color Emoji", "Segoe UI Emoji", "Segoe UI Symbol";
  background: #0f172a;
  display: flex;
  justify-content: center;
  align-items: center;
  min-height: 100vh;
  margin: 0;
  padding: 20px;
}

.prompt-container {
  width: 100%;
  max-width: 600px;
  position: relative;
}

.glow-wrapper {
  position: relative;
  border-radius: 20px;
  padding: 2px;
  background: linear-gradient(90deg, #3b82f6, #8b5cf6, #ec4899, #3b82f6);
  background-size: 300% 300%;
  animation: gradientGlow 4s ease infinite;
  z-index: 1;
}

.glow-wrapper::before {
  content: "";
  position: absolute;
  inset: -4px;
  border-radius: 24px;
  background: inherit;
  filter: blur(12px);
  opacity: 0.6;
  z-index: -1;
  animation: gradientGlow 4s ease infinite;
}

@keyframes gradientGlow {
  0% {
    background-position: 0% 50%;
  }
  50% {
    background-position: 100% 50%;
  }
  100% {
    background-position: 0% 50%;
  }
}

.input-box {
  background: #1e293b;
  border-radius: 18px;
  display: flex;
  flex-direction: column;
  padding: 12px;
}

#prompt-area {
  background: transparent;
  border: none;
  color: #f8fafc;
  resize: none;
  outline: none;
  font-family: inherit;
  font-size: 1rem;
  padding: 8px;
  line-height: 1.5;
  min-height: 44px;
  max-height: 200px;
  overflow-y: auto;
}

#prompt-area::placeholder {
  color: #64748b;
}

.actions {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding-top: 8px;
  border-top: 1px solid #334155;
  margin-top: 4px;
}

.attach-btn, 
.submit-btn {
  background: transparent;
  border: none;
  cursor: pointer;
  display: flex;
  justify-content: center;
  align-items: center;
  border-radius: 50%;
  width: 36px;
  height: 36px;
  transition: background 0.2s;
}

.attach-btn {
  color: #94a3b8;
}

.attach-btn:hover {
  background: #334155;
  color: #f8fafc;
}

.submit-btn {
  background: #3b82f6;
  color: #ffffff;
}

.submit-btn:hover {
  background: #2563eb;
}

const textarea = document.getElementById("prompt-area");

textarea.addEventListener("input", function() {
  this.style.height = "auto";
  this.style.height = this.scrollHeight + "px";
});

Back to Snippets

AI Prompt Input with Glow Effect JS

Upgrade your search with an AI prompt input field. It features an auto-expanding text area and a subtle gradient glow, which just looks incredible on dark themes.

261

#javascript

#css

#ai

#prompt

#input

#gradient

#glow

#dark mode

Run /HTML *CSS ()JS Output Console0 Live Updates Focus

*, *::before, *::after {
  box-sizing: border-box;
}

body {
  font-family: system-ui, "Segoe UI", Roboto, Helvetica, Arial, sans-serif, "Apple Color Emoji", "Segoe UI Emoji", "Segoe UI Symbol";
  background: #0f172a;
  display: flex;
  justify-content: center;
  align-items: center;
  min-height: 100vh;
  margin: 0;
  padding: 20px;
}

.prompt-container {
  width: 100%;
  max-width: 600px;
  position: relative;
}

.glow-wrapper {
  position: relative;
  border-radius: 20px;
  padding: 2px;
  background: linear-gradient(90deg, #3b82f6, #8b5cf6, #ec4899, #3b82f6);
  background-size: 300% 300%;
  animation: gradientGlow 4s ease infinite;
  z-index: 1;
}

.glow-wrapper::before {
  content: "";
  position: absolute;
  inset: -4px;
  border-radius: 24px;
  background: inherit;
  filter: blur(12px);
  opacity: 0.6;
  z-index: -1;
  animation: gradientGlow 4s ease infinite;
}

@keyframes gradientGlow {
  0% {
    background-position: 0% 50%;
  }
  50% {
    background-position: 100% 50%;
  }
  100% {
    background-position: 0% 50%;
  }
}

.input-box {
  background: #1e293b;
  border-radius: 18px;
  display: flex;
  flex-direction: column;
  padding: 12px;
}

#prompt-area {
  background: transparent;
  border: none;
  color: #f8fafc;
  resize: none;
  outline: none;
  font-family: inherit;
  font-size: 1rem;
  padding: 8px;
  line-height: 1.5;
  min-height: 44px;
  max-height: 200px;
  overflow-y: auto;
}

#prompt-area::placeholder {
  color: #64748b;
}

.actions {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding-top: 8px;
  border-top: 1px solid #334155;
  margin-top: 4px;
}

.attach-btn, 
.submit-btn {
  background: transparent;
  border: none;
  cursor: pointer;
  display: flex;
  justify-content: center;
  align-items: center;
  border-radius: 50%;
  width: 36px;
  height: 36px;
  transition: background 0.2s;
}

.attach-btn {
  color: #94a3b8;
}

.attach-btn:hover {
  background: #334155;
  color: #f8fafc;
}

.submit-btn {
  background: #3b82f6;
  color: #ffffff;
}

.submit-btn:hover {
  background: #2563eb;
}