<a href="https://zalo.me/0977234149" class="hotline-btn" target="_blank">
<div class="phone-icon">
<i class="fas fa-phone-alt"></i>
</div>

<div class="phone-content">
<span>Hotline / Zalo</span>
<strong>0977 234 149</strong>
</div>
</a>

.hotline-btn{
display:flex;
align-items:center;
gap:15px;
padding:12px 22px;
border-radius:60px;
background:linear-gradient(135deg,#123d87,#0d2d66);
text-decoration:none;
transition:.35s;
box-shadow:0 8px 20px rgba(0,0,0,.25);
}

.hotline-btn:hover{
transform:translateY(-3px) scale(1.05);
box-shadow:0 18px 35px rgba(0,90,255,.35);
background:linear-gradient(135deg,#ff7b00,#ff5100);
}

.phone-icon{
width:48px;
height:48px;
border-radius:50%;
background:white;
display:flex;
justify-content:center;
align-items:center;
color:#0b3d91;
font-size:18px;
transition:.35s;
}

.hotline-btn:hover .phone-icon{
transform:rotate(20deg);
}

.phone-content span{
display:block;
font-size:12px;
color:#dbe7ff;
}

.phone-content strong{
display:block;
font-size:22px;
color:#fff;
font-weight:700;
letter-spacing:.5px;
}