* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}
html ´{
    font-size: 62.5%;
}
body {
    background-color: #F5F5FB;
    display: grid;
    place-items: center;
    height: 100vh;
    font-family: 'Open Sans', sans-serif;
    overflow: hidden;
}
.container {
    text-align: center;
}
.progress-container {
    display: flex;
    justify-content: space-between;
    position: relative;
    margin-bottom: 30px;
    max-width: 100%;
    width: 350px;
}
.progress-container::before {
    content: '';
    background-color: #ebebeb;
    position: absolute;
    top: 50%;
    left: 0;
    transform: translateY(-50%);
    height: 4px;
    width: 100%;
    z-index: -1;
    transition: .4s ease;
}
.progress {
    background-color: #3498db;
    position: absolute;
    top: 50%;
    left: 0;
    transform: translateY(-50%);
    height: 4px;
    width: 0%;
    z-index: -1;
    transition: .4s ease;
}
.circle {
    background-color: white;
    color: #999;
    border-radius: 50%;
    height: 30px;
    width: 30px;
    display: flex;
    align-items: center;
    justify-content: center;
    border: 3px solid #ebebeb;
    transition: .5s ease;
}
.circle.active {
    border-color: #3498db;
}
.btn {
    background-color: #3498db;
    color: white;
    border: 0;
    cursor: pointer;
    border-radius: 10px;
    font-family: inherit;
    padding: 8px 24px;
    margin: 5px;
    font-size: 14px;
    transition: .5s ease;
}

.btn:hover {
    box-shadow: 0 0 5px rgba(0, 0, 0, 0.1);
    transform: scale(1.1);
}
.btn:active {
    transform: scale(0.9);
}
.btn:disabled {
    background-color: #ebebeb;
    color: #999;
}