<div class="box">
  <div class="box__more">
  <div class="box__btn">еще</div>
  </div>
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</div>

<div class="box">
  <div class="box__more">
  <div class="box__btn">Показать еще</div>
  </div>
  
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</div>

body {
  display: flex;
  justify-content: center;
  align-items: center;
  flex-direction: column;
  min-height: 100vh;
  gap: 30px;
  box-sizing: border-box;
  padding: 40px;
}

.box {
  line-height: 30px;
  font-size: 20px;
  max-width: 500px;
  height: 90px;
  overflow: hidden;
  // animation: box 15s ease infinite;
  display: -webkit-box;
  -webkit-box-orient: vertical;
  -webkit-line-clamp: 3;
}

@keyframes box {
  0% {
    max-width: 500px;
  }
  50% {
    max-width: 280px;
  }
  100% {
    max-width: 500px;
  }
}

.box__more {
  float: right;
  height: 100%;
  display: flex;
  justify-content: center;
  align-items: flex-end;
  flex-wrap: wrap;
  shape-outside: inset(calc(100% - 30px) 0 0 0);
  margin-left: 20px;
}

.box__btn {
  box-sizing: border-box;
  padding: 0 5px;
  height: 30px;
  display: flex;
  justify-content: center;
  align-items: center;
  flex-wrap: wrap;
  text-align: center;
  background-color: orange;
  cursor: pointer;
}