<label class="box">
  <input type="text" class="box__input" placeholder="&nbsp;">
  <box class="box__content">Это <span class="color-red">подсказка</span></box>
</label>
<label class="box">
  <input type="text" class="box__input" placeholder="&nbsp;">
  <box class="box__content">Это <span class="color-red">подсказка</span> 2</box>
</label>

body {
  padding: 0;
  margin: 0;
  min-height: 100vh;
  display: flex;
  justify-content: center;
  align-items: center;
  flex-direction: column;
  font-size: 25px;
}

.color-red {
  color: red;
}

.box {
  display: inline-block;
  position: relative;
  z-index: 0;
  overflow: hidden;
  margin: 10px;
}

.box__input {
  background-color: yellow;
  border: 1px solid #000;
  height: 50px;
  box-sizing: border-box;
  padding: 0 20px;
  color: #000;
  width: 300px;
  font-size: 20px;
}

.box__content {
  box-sizing: border-box;
  padding: 0 20px;
  position: absolute;
  left: 0;
  top: 50%;
  transform: translateY(-50%) translateX(0);
  opacity: 0.8;
  pointer-events: none;
  color: #000;
  transition: 0.3s all;
}

.box__input:focus ~ .box__content,
.box__input:not(:placeholder-shown) ~ .box__content {
  transform: translateY(-50%) translateX(100%);
  opacity: 0;
}