* {
    box-sizing: border-box;
}

html, body {
    margin: 0 auto;
    max-width: 375px;
    font-family: 'Source Sans 3', sans-serif;
    background-color: #F5F5F5;
}

header {
    position: sticky;
    display: flex;
    flex-grow: 0;
    align-items: center;
    justify-content: space-between;
    top: 0;
    padding: 5px 8px;
    border-bottom: 5px solid #C6C6C6;
    background-color: #FFFFFF; 
    box-shadow: 0 2px 4px 0 rgba(0, 0, 0, 0.1), 0 3px 10px 0 rgba(0, 0, 0, 0.10);
}

h1 {
    font-size: 14px;
    font-weight: 900;
    margin: 0;
}

h2 {
    font-size: 13px;
    font-weight: 400;
    margin: 0;
}

span {
    margin: 0;
    font-weight: 700;
}

.post-caption {
    margin: 0;
    padding: 8px 0px;
}

.container {
    color: #000000;
    background-color: #FFFFFF;
    border-bottom: 10px solid #C6C6C6;
}

.post-container {
    display: flex;
    flex-direction: column;
    padding: 0 10px;
    box-shadow: 0px 0px 25px gray;
}

.logo {
    width: 127px;
}

.user-avatar,
.post-avatar {
    width: 37px;
    border-radius: 50%;
}

.post-header {
    display: flex;
    gap: 10px;
    align-items: center;
    padding: 10px 0;
}

.post-img {
    width: 100%;
}

.post-footer {
    display: flex;
}

.like img {
    width: 25px;
}

.like .heart-full {
    display: none; 
}

.btn {
    width: 25px;
    cursor: pointer;
    user-select: none;
    padding: 5px 0px;
}

.btn.on .heart-full {
    display: block;
}

.btn.on .heart-empty {
    display: none;
}

.btn:hover {
    opacity: 60%;
    transition-duration: .5s;
}