JSFiddle - React, Tailwind, and code Playground

HTML

<div class="qib-container">
  <button type="button" class="minus qib-button">-</button>
  <div class="quantity">
    <label class="screen-reader-text" for="quantity_5d33c50739412">Stainless steel standoff - satin finish quantity</label> <input type="number" id="quantity_5d33c50739412" class="input-text qty text" step="1" min="1" max="" name="quantity" value="1"
      title="Qty" size="4" inputmode="numeric"></div><button type="button" class="plus qib-button">+</button></div>

CSS

.qib-button {
  line-height: 1.2;
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  height: 35px;
  width: 30px;
  color: #000;
  background: #e2e2e2;
  border-color: #cac9c9;
  vertical-align: top;
  font-size: 16px;
  letter-spacing: 0;
  border-style: solid;
  border-width: 1px;
  transition: none;
  border-radius: 2px;
}

.qib-container div.quantity {
  margin: 0;
  padding: 0;
  border: none;
  width: auto;
}

.qib-container .quantity input.qty {
  line-height: 1.2;
  padding: 0;
  box-sizing: border-box;
  height: 35px;
  width: 45px;
  min-height: unset;
  min-width: unset;
  box-shadow: none;
  font-size: 15px;
  border-style: solid;
  border-color: #cac9c9;
  border-width: 1px;
  border-radius: 2px;
  text-align: center
}

.screen-reader-text {
  border: 0;
  clip: rect(1px, 1px, 1px, 1px);
  -webkit-clip-path: inset(50%);
  clip-path: inset(50%);
  height: 1px;
  margin: -1px;
  overflow: hidden;
  padding: 0;
  position: absolute;
  width: 1px;
  word-wrap: normal !important;
}

.qib-container {
  display: flex;
}

.qib-container > *:not(:last-child),
.input-text.qty {
  margin-right: 5px;
}