*{
margin:0;
padding:0;
box-sizing:border-box;
}

body{
    font-family:Inter,sans-serif;

    background:
    linear-gradient(rgba(32,32,32,.82),rgba(32,32,32,.82)),
    url("background.png");

    background-size:cover;
    background-position:center;
    background-attachment:fixed;

    color:white;

    display:flex;
    justify-content:center;
    align-items:center;

    min-height:100vh;
}

.overlay{

width:100%;

padding:50px 25px;

}

.container{

max-width:900px;

margin:auto;

text-align:center;

animation:fadeUp 1s ease;

}

.logo{
width:300px;
margin-bottom:25px;
}

h1{

font-size:54px;

font-weight:800;

margin-bottom:15px;

}

h2{

font-size:28px;

font-weight:300;

color:#63A9B3;

margin-bottom:40px;

}

p{

font-size:20px;

line-height:1.8;

max-width:750px;

margin:auto;

opacity:.9;

}

.services{

display:flex;

flex-wrap:wrap;

justify-content:center;

gap:15px;

margin:50px 0;

}

.services span{

padding:12px 20px;

border:1px solid rgba(255,255,255,.2);

border-radius:30px;

background:#3E3E3E;
transition:.3s;
cursor:pointer;

}
.services span:hover{

background:#63A9B3;

transform:translateY(-4px);

}

.buttons{

display:flex;

justify-content:center;

gap:20px;

flex-wrap:wrap;

}

.btn{

background:#63A9B3;

box-shadow:0 10px 25px rgba(99,169,179,.35);

}
.btn:hover{

transform:translateY(-4px);

box-shadow:0 18px 35px rgba(99,169,179,.5);

}

padding:16px 36px;

border-radius:6px;

text-decoration:none;

color:white;

font-weight:700;

transition:.3s;

}

.btn:hover{

transform:translateY(-3px);

}

.outline{

background:transparent;

border:2px solid #63A9B3;

}

footer{

margin-top:60px;

color:#bbb;

}

@keyframes fadeUp{

from{

opacity:0;

transform:translateY(30px);

}

to{

opacity:1;

transform:translateY(0);

}

}

@media(max-width:768px){

.logo{

width:170px;

}

h1{

font-size:36px;

}

h2{

font-size:22px;

}

p{

font-size:18px;

}

}\
.call{

position:fixed;

right:30px;

bottom:30px;

background:#63A9B3;

color:white;

padding:18px;

border-radius:50%;

font-size:24px;

text-decoration:none;

box-shadow:0 8px 25px rgba(0,0,0,.3);

}
<a href="tel:0420444502" class="call">
☎
</a>