:root {
    --linea-border-fill: #219dd6;
    --linea-border-empty: #bdbdbd;
}

* {
    box-sizing: border-box;
}

body {
    font-family:'Trebuchet MS', sans-serif;
    display: flex;
    align-items: center;
    justify-content: center;
    height: 100vh;
    margin: 0;
}

h1 {
    margin-bottom: 90px;
}

.fab{
    font-size: 4rem;
}

.active .fa-html5{
    color: #ff5773;
}
.active .fa-css3-alt{
    color: #264de4;
}
.active .fa-js{
    color: #f7e010;
}
.active .fa-react{
    color: #61dbfb;
}

.container{
    text-align: center;
}

.progress-container {
    display: flex;
    justify-content: space-between;
    position: relative;
    margin-bottom: 30px;
    max-width: 100%;
    width: 700px;
}

.progress-container::before{
    content: "";
    background: var(--linea-border-empty);
    position: absolute;
    top: 50%;
    left: 0;
    transform: translateY(-50%);
    height: 7px;
    width: 100%;
    z-index: -1;
    transition: 0.4s ease;
}

.progress{
    background: var(--linea-border-fill);
    position: absolute;
    top: 50%;
    left: 0;
    transform: translateY(-50%);
    height: 4px;
    width: 0%;
    z-index: -1;
    transition: 0.4s ease;
}

.circle {
    background: #fff;
    color: #999;
    border-radius: 50%;
    height: 100px;
    width: 100px;
    border: 7px solid #b2bec3;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: 0.4s ease;
}

.circle.active {
    border-color: var(--linea-border-fill);
}

.btn{
    background-color: var(--linea-border-fill);
    color: #fff;
    border-radius: 7px;
    border: 0;
    cursor: pointer;
    font-family: inherit;
    padding: 8px 30px;
    margin: 5px;
    font-size: 24px;
}

.btn:active{
    transform: scale(0.97);
}

.btn:disabled {
    background-color: var(--linea-border-empty);
    cursor: not-allowed;
}